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0012]As a first feature of the present invention, a semiconductor laser excited solid-state laser apparatus is provided having a nonlinear optical crystal installed in an optical resonator, where a solid-state laser medium is provided to be excited by the laser beam emitted from a semiconductor laser, for producing and outputting a harmonic of the fundamental wave oscillated in the optical resonator while detecting a portion of the harmonic and controlling the driving current of the semiconductor laser so that the harmonic remains constant, wherein the solid-state laser medium is Nd;YAG, the Nd:YAG has two ends thereof extending vertical to the optical axis, the Nd:YAG is arranged to be coated at one of the two ends which acts as one end of the optical resonator with an HR coating acting on the light produced by transition of energy from level 4F3/2 to level 4I11/2, and the Nd:YAG functions as a band reflecting mirror with its two ends interfering the reflected light and its thickness along the ...

Objective To evaluate the effect of semiconductor laser irradiation on root canal sealing after routine root canal therapy (RCT). Methods Sixty freshly extracted single-rooted human teeth were randomly divided into six groups (n = 10). The anatomic crowns were sectioned at the cementoenamel junction and the remaining roots were prepared endodontically with conventional RCT methods. Groups A and B were irradiated with semiconductor laser at 1W for 20 seconds; Groups C and D were ultrasonically rinsed for 60 seconds as positive control groups; Groups E and F without treatment of root canal prior to RCT as negative control groups. Root canal sealing of Groups A, C and E were evaluated by measurements of apical microleakage. The teeth from Groups B, D and F were sectioned, and the micro-structures were examined with scanning electron microscopy (SEM). One way ANOVA and LSD-t test were used for statistical analysis (α = .05). Results The apical sealing of both the laser irradiated group and the

A spectroscopic method of molecular detection based on dispersion measurements using a frequency-chirped laser source is presented. An infrared quantum cascade laser emitting around 1912 cm−1 is used as a tunable spectroscopic source to measure dispersion that occurs in the vicinity of molecular ro-vibrational transitions. The sample under study is a mixture of nitric oxide in dry nitrogen. Two experimental configurations based on a coherent detection scheme are investigated and discussed. The theoretical models, which describe the observed spectral signals, are developed and verified experimentally. The method is particularly relevant to optical sensing based on mid-infrared quantum cascade lasers as the high chirp rates available with those sources can significantly enhance the magnitude of the measured dispersion signals. The method relies on heterodyne beatnote frequency measurements and shows high immunity to variations in the optical power received by the photodetector.. ©2010 Optical ...

Block Engineerings (Blocks) laser-based products utilize next generation quantum cascade lasers (QCLs) and infrared absorption spectroscopy. QCLs were invented and first fabricated at Bell Laboratories in the late 70s by Federico Capasso, Jerome Faist and their colleagues, but their wide use for applications outside the laboratories has only started a few years ago.. QCLs are semiconductor devices, which operate differently from conventional semiconductor lasers. In general, a semiconductor material absorbs photons when excited electrons move from the valence band into the conduction band (leaving positive holes). In reverse, photons are emitted when electrons drop into the valence band and eliminate the holes. In conventional semiconductor lasers, these actions occur in the active region, which is typically a two-layer structure of different semiconductor materials, forming a p-n junction. Specially designed cladding layers around the active region constrain the generated photons, ...

a) Emission spectra of a 5-µm-wide 2.5-mm-long ridge encapsulated device with and without liquids. The spectra were obtained at 297 K. The device was driven with 540 mA current pulses, 20-ns-long at the repetition rate of 80 kHz. Note that the data in Figs. 4 and 6 is obtained with a different device. Inset shows the zoom-in of the laser modes situated around 1143 cm-1 (b) Dependence of the TM00 laser mode effective refractive index on a liquid refractive index for deep-etched ridge waveguide quantum cascade lasers with various ridge widths. The liquid absorbance, In(n), is assumed to be 0 in the simulations. Simulations were performed using commercial software packages, BeamPROP (R-Soft Design Group, Inc). Note that the dependence of the effective refractive index of the laser mode on the liquid refractive index may be used for microfluidic tuning of quantum cascade lasers [16 ...

have the potential to replace electronic circuitsPhysicists at The University of Texas at Austin, in collaboration with colleagues in Taiwan and China, have developed the worlds smallest semiconductor laser, a breakthrough for emerging photonic technology with applications from computing to medicine.. The scientists report their efforts in this weeks Science.. Miniaturization of semiconductor lasers is key for the development of faster, smaller and lower energy photon-based technologies, such as ultrafast computer chips; highly sensitive biosensors for detecting, treating and studying disease; and next-generation communication technologies.. Such photonic devices could use nanolasers to generate optical signals and transmit information, and have the potential to replace electronic circuits. But the size and performance of photonic devices have been restricted by whats known as the three-dimensional optical diffraction limit.. We have developed a nanolaser device that operates well below the ...

A handbreadth-sized laser beam projecting probe for beauty treatment, comprising: a semiconductor laser device for producing a laser beam; a drive circuit for driving the semiconductor laser device; a heat sink for removing the generated heat from the semiconductor laser device; a CPU for controlling the radiation of the laser beam from the semiconductor laser device; a condenser lens for condensing the laser beam from the semiconductor laser device; an adjuster for adjusting the distance between the skin and the condenser lens; and an on-and-off switch associated with an electric power supply. The handbreadth-sized probe can be carried everywhere, permitting the practice of beauty treatment when desired.

TY - JOUR. T1 - Degenerate and nondegenerate lateral-mode patterns in quantum cascade lasers. AU - Stelmakh, Nikolai. AU - Vasilyev, Michael. AU - Toor, Fatima. AU - Gmachl, Claire. N1 - Funding Information: This work was supported in part by DARPA Contract No. HR0011-08-1-0063 and by MIRTHE (NSF-ERC Grant No. EEC-0540832). We thank Fred J. Towner of Maxion Technologies for the growth of the QC wafer used in this work. PY - 2009. Y1 - 2009. N2 - We experimentally investigate near-field lateral-mode patterns of 10-25-μm -wide quantum cascade wide-ridge lasers with few lateral modes using a 1-GHz-resolution spatially resolving midinfrared spectrometer. The results supported by simple box-model theory demonstrate that, depending on the laser geometry, one can either obtain lateral-mode frequency degeneracy or find the high-order lateral modes to be blueshifted or redshifted from the fundamental. We show that, with proper laser geometry, all longitudinal and lateral modes can be frequency ...

0007] Meanwhile, a beam output from the typical semiconductor laser diode is, through an outer lens, focused on an external device such as an optical fiber. Also, in the case of the laser semiconductor as illustrated in FIG. 1, an optical output in a section of the tapered waveguide 2 is high relative to the narrow waveguide 1, and thus the optical output is, through the outer lens, focused on the external device such as an optical fiber. At this point, a different focal distance of the beam in a vertical direction and a horizontal direction of the tapered waveguide 2 causes astigmatism. Particularly, when a single mode beam generated from the narrow waveguide 1 travels through the tapered waveguide 2, a wavefront of the beam crossing an upper surface of the tapered waveguide 2 is curved. However, since a thickness of the tapered waveguide 2 is even smaller than its length or width, a wavefront of the beam crossing a vertical plane with respect to the upper surface of the tapered waveguide 2 is ...

March 4, 1969 YASUO NANNICHI 3,431,513 TWIN SEMICONDUCTOR LASER Filed Sept. 27, 1965 Sheet Tlqi. INVENTOR X1500 N/l/v/v/cw 3,431,513 TWIN SEMICONDUCTUR LASER Yasuo Nannichi, Tokyo, Japan, assignor to Nippon Electric Company, Limited, Tokyo, Japan, a corporation of Japan Filed Sept. 27, 1965, Ser. No. 490,521 Claims priority, applications Japan, Sept. 28, 1964, 39/55,439, $965,440 US. Cl. 33194.5 Int. Cl. Hills 3/16; H03k 19/14, 23/12 This invention relates to semiconductor elements of the electroluminescent type and more particularly to a novel structure provided for such elements which are capable of use as circuit elements in optoelectronic circuits of various kinds. It is well known that when a P-N junction for performing the radiative recombination of charged carriers is formed in a Group IIIV compound semiconductor and the end faces of the semiconductor which are perpendicular to the P-N junction are made plane and optically parallel and are polished to a high degree of accuracy so as to ...

Several spectroscopic methods based on mid-infrared quantum cascade lasers for the ultrasensitive detection of nitric oxide have been developed with detection limit in ppbv and sub-ppbv range. We...

/PRNewswire/ -- Research and Markets has announced the addition of the Global Semiconductor Laser Treatment Market 2016-2020 report to their offering. The...

Our objective is to develop, demonstrate and validate prototype laser wind sensors that measure wind speed and direction based on low-cost, compact semiconductor lasers and new optical methods we have recently devised and patented. These wind sensor prototypes will represent the next-generation of compact, rugged and inexpensive laser-based wind sensors for wind energy research and turbine industry ...

The Terahertz domain (THz), situated between the visible and microwave energy range, turns out to be very promissing in terms of applications. However its application potential is not fully used because of the lack for compact sources able to cover a large part of its energy range. Quantum Cascade Lasers (QCL) are good candidates for this purpose, because there are both compact and highly tunable. But in the THz range, the existing QCLs suffer from the operation temperature limitation ( 200K ), which is very restricting from the application viewpoint. It comes from an intrinsic property of the materials commonly used to build QCLs: the LO-phonon energy. As a consequence a strong competition between the LO-phonon transition and the QCL radiative transition arise at room temperature, which hinder the lasing efficiency. To tackle this issue, we choose to make use of ZnO, because its LO-phonon energy is twice larger compared to the aforementioned materials, thus enabling to keep the lasing action

Researchers at Harvard have demonstrated a new type of technology called the quantum cascade laser nanoantenna, that might be used to design smaller, possi

If you have a question about this talk, please contact Edmund Ward.. Fully processed wafers of III -V semiconductor lasers have a potential value of tens of thousands of pounds; yield and reliability issues can therefore be very expensive. The most challenging problems occur when defects or processing issues which are introduced during fabrication are latent in the device; performance is good upon initial test, but the devices degrade during burn in or an accelerated life test trial. This talk describes the type of failure analysis study which is needed to solve these issues, using examples from work done at Bookham Technology, Caswell. Specimen preparation is challenging, requiring analysis of specific sites on individual devices, and usually several types of analysis are used, including electroluminescence, SEM , FIB and TEM - often on the same device. Results of an accelerated life test study of InAs/GaAs quantum dot lasers are also presented. These indicate that quantum dot material is ...

We experimentally demonstrate the realization of a parity-time (PT) symmetry breaking in optically coupled semiconductor lasers (SCLs). The two SCLs are identical except for a detuning between their optical emission frequencies. This detuning is analogous to the gain-loss parameter found in optical PT systems. To model the coupled SCLs, we employ the standard rate equations describing the electric field and carrier inversion of each SCL, and show that, under certain conditions, the rate equations reduce to the canonical, two-site PT- symmetric model. This model captures the global behavior of the laser intensity as the system parameters are varied. Overall, we find that this bulk system (coupled SCLs) provides an excellent test-bed to probe the characteristics of PT-breaking transitions, including the effects of time delay ...

TY - JOUR. T1 - A unifying view of bifurcations in a semiconductor laser subject to optical injection. AU - Wierczorek, SM. AU - Krauskopf, B. AU - Lenstra, D. PY - 1999. Y1 - 1999. M3 - Article (Academic Journal). VL - 172(1-6). SP - 279. EP - 295. JO - Optics Communications. JF - Optics Communications. SN - 0030-4018. ER - ...

In an advanced online publication of the journal Nature dated Aug. 30, a team of researchers from USA and China -- led by Xiang Zhang of University of California, Berkeley -- has reported the creation of the worlds smallest semiconductor laser, capable of generating visible light in a space of only 5 nanometer -- smaller than a single protein molecule. The team not only successfully squeezed light into such a tight space, but found a novel way to keep that light energy from dissipating as it moved along, thereby achieving laser action. The research was performed at the NSF Nanoscale Science and Engineering Centre of University of California -- Berkeley, the Materials Sciences Division of Lawrence Berkeley National Laboratory, and the State Key Lab for Mesoscopic Physics and School of Physics of the Peking University -- China ...

Monolithic colliding pulse mode-locking (CPM) in semiconductor lasers is compared with self colliding pulse mode-locking (SCPM) through a large signal dyna

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QCL is a semiconductor laser with emission wavelength in the mid-IR range (4 um to 10 um). Because its emission principle is completely different from normal LDs, the QCL has gained attention as an lnnovative solution for mid-IR applications such as trace gas analysis in environmental monitoring.

This project will design and deliver a high accuracy monitor for the photo-chemically coupled pollutants nitric oxide, nitrogen dioxide and ozone using infrared absorption spectroscopy with quantum cascade (QC) lasers. The target molecules are monitored at air quality stations worldwide using instruments which require frequent calibration and are subject to significant chemical interferences (in the cases of NO2 and O3). This QC monitor will initially provide a portable measurement standard to calibrate the existing network and could eventually replace existing instruments. QC lasers are spectroscopically stable and can be operated near room temperature when in pulsed mode. This allows the design of compact, rugged, monitors which are also highly accurate. The main Phase 2 objectives are to complete the detailed design and construction of an instrument which can simultaneously measure all three species with high time resolution and high accuracy. This instrument will be delivered to NIST ...

Introduction: Increased resistance of oral pathogens to conventional antimicrobial agents has led to the use of alternative methods to overcome microbial resistance. The purpose of this in vitro study was to evaluate the effect of antimicrobial photodynamic therapy on Streptococcus mutans. Materials & Methods: In this in vitro study, a diode laser emitting a wavelength of 810nm was used in association with EmunDo as a photosensitizing agent. Suspensions of Streptococcus mutans were prepared and divided into six groups by treatment: 1) EmunDo, 2) diode laser irradiation (100mW, 90 seconds), 3) diode laser irradiation (300mW, 30 seconds); 4) EmunDo+diode laser irradiation (100mW, 90seconds), 5) EmunDo+diode laser irradiation (300mW, 30 seconds), 6) control (no treatment). Immediately and 24 hours after photodynamic therapy, the bacterial suspensions were cultured. After incubation at 37°C, viable microorganisms of Streptococcus mutans were counted and the results were reported in ...

Evalution of the bactericidal effect and permeability changes on root dentin after Er,Cr:YSGG laser and diode laser irradiation ...

Osram Opto Semiconductors GmbH of Regensburg, Germany has reported what it claims is the first direct-emitting true green indium gallium nitride (InGaN) laser diode - emitting light at 515nm - with high optical output power (50mW). Osram Opto already offers blue-emitting InGaN laser diodes for commercial applications. But, in the true green 515-535nm wavelength range, efficient high-quality semiconductor lasers have been commercially available only as frequency-doubled versions. Compared with semiconductor lasers based on existing frequency doubling technology, direct-emitting green lasers are more compact, offer greater temperature stability, are easier to control, and have higher modulation capability at several 100MHz, says the firm. Although the new laser is just at the pre-development stage, in the medium term direct-emitting green lasers could therefore replace frequency-doubled lasers for many applications, says Osram Opto. The laboratory prototype achieved optical output power of 50mW ...

Faraday modulation spectroscopy (FAMOS) is a laser-based spectroscopic dispersion technique for detection of paramagnetic molecules in gas phase. This thesis presents both a new theoretical description of FAMOS and experimental results from the ultra-violet (UV) as well as the mid-infrared (MIR) regions. The theoretical description, which is given in terms of the integrated linestrength and Fourier coefficients of modulated dispersion and absorption lineshape functions, facilitates the description and the use of the technique considerably. It serves as an extension to the existing FAMOS model that thereby incorporates also the effects of lineshape asymmetries primarily originating from polarization imperfections. It is shown how the Fourier coefficients of modulated Lorentzian lineshape functions, applicable to the case with fully collisionally broadened transitions, can be expressed in terms of analytical functions. For the cases where also Doppler broadening needs to be included, resulting in ...

An optically-pumped semiconductor (OPS) laser includes a multilayer structure including a mirror-structure surmounted by a multilayer semiconductor gain-structure. A membrane mirror is spaced apart from the mirror structure to form a laser resonator between the mirror structure and the membrane mirror, with the gain-structure included in the laser resonant cavity. Pump light is transmitted through the membrane mirror into the gain structure. The membrane mirror includes a grating having parameters selected such that the membrane mirror has different reflectivities at the wavelength of the laser in two orthogonally-oriented planes of polarization. The membrane mirror is axially movable along the resonator axis for varying the resonator length to select the wavelength of the single lasing mode.

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U. LEEDS (UK) - Researchers have produced terahertz ray pulses from a quantum cascade laser, the first time rays have been made to emit separate packets of radiation, rather than in a continuous beam.. The work, published online in Nature Photonics, could open up new ways for T-rays to image natural and synthetic materials.. T-rays, a band of radiation in the electromagnetic spectrum that falls between radio waves and visible light, can be used to detect impurities in chemical and biological materials, generating characteristic spectral fingerprints that are used to identify different substances.. Researchers have been working with a technique known as terahertz time-domain spectroscopy, a particularly sensitive way of probing materials using pulses of T-rays. Up until now, these pulses have been made using laser sources that generated very little power (around one millionth of a watt).. Harnessing the power of a quantum cascade laser that is almost 10,000 times more powerful, researchers ...

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The ever-increasing demand for broadband capacity of the global optical communication networks puts enormous requirements on the semiconductor laser used in the optical transmitter. Industrial standard bodies for optical communication project requirements of single-channel data rates as high as 100 Gbit/s around year 2020. This is a significant step with respect to todays technology which is only at the verge of introducing 25 Gbit/s emitters. The preferred light source for these applications is the vertical-cavity surface-emitting laser (VCSEL) which can offer cost- and power-efficient directly modulated operation. However, it has proven extremely difficult to push the modulation bandwidth of VCSELs beyond 30 GHz and radically new device concepts are demanded to meet the upcoming needs. One such new device paradigm consists of the transistor laser which is the fusion of a semiconductor laser and a high-speed heterojunction bipolar transistor (HBT) into a single device, with potential ...

Picture: Eoin OReilly. OReilly was honoured as one of four luminary scientists who challenged the widely accepted orthodoxy of the 1980s that semiconductor lasers should be strain-free. The scientists also predicted the benefits of incorporating one strained layer or more in the active regions of semiconductor lasers, creating an ideal band structure.. The Rank Prize Fund recognised OReillys contribution while also honouring his co-researcher at University of Surrey, Alfred Adams, and independent work by Eli Yablonovitch at Bell Communications Research and by Gordon Osbourn at Sandia National Laboratories. The researchers use of strained structures has reduced threshold currents and increased efficiency and output power. It has also maximized operating frequency while decreasing linewidth and frequency chirp, and enabled a wide range of laser wavelengths to be accessed that would not otherwise be possible. This has led to the dominant role that strained lasers now play in optoelectronic ...

Novel, complex, multi-valued locking range and stability map are obtained for injection locked F-P lasers through inclusion, for the first time, of all sup

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Several thermal TRP ion channels have recently been identified. These channels are directly gated by temperature, but the mechanisms have remained elusive. Studies of their temperature gating have been impeded by lack of methods for rapid alteration of temperature in live cells. As a result, only me …

Thirty-one lines of the fundamental vibration-rotation band of the NF free radical in its a 1 state have been detected in absorption near 8.6 µm using a tunable infrared diode laser. Linewidths were Doppler limited and several transitions were accompanied by resolved hyperfine structure due to fluorine and nitrogen nuclear moments. Wave number calibration using accurately determined N2O lines yielded v0 = 1165.952±0.001 cm^−1 for the band center. Rotational and centrifugal distortion constants for both v = 0 and 1 states have also been determined. ...

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This work presents the application of organic semiconductor distributed feedback laser as free-space excitation source in Raman spectroscopy. Surface-enhanced

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In current study we aimed to examine the effect of a low-level laser therapy on the pain, mouth opening and swelling of patients whose impacted 3rd molar tooth was extracted in addition measurement volumetrically to the edema with 3dMD face system. It was surveyed 15 patients who had bilateral symmetric lower 3rd molars. Surgical sides of patients were randomly separated into two groups: the study group and the control group. It was applied extra oral low-level laser therapy (LLLT, 0.3 W, 40 s, 4 J/cm(2)) to the study group (n = 15) after the surgical operation and on the 2nd day. Only routine postoperative recommendation (ice application) was made in the control (n = 15) group. The maximum mouth opening, pain level and facial swelling evaluated. 3dMD Face® (3dMD, Atlanta, GA) Photogrammetric System was used to evaluate volumetric changes of the swelling. There was no statistically significant difference in the edema and interincisal opening between the groups and the pain level in the laser ...

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In periodontal therapy, the use of low-level diode lasers has recently been considered to improve wound healing of the gingival tissue. However, its effects on human gingival epithelial cells (HGECs)...

Mid-infrared Raman sources based on spontaneous Raman scattering have been demonstrated in a 15-μm diameter glass-clad crystalline germanium optical fiber and in a germanium-wire. A quantum cascade laser was used as pump at a wavelength of 5.62 μm. Because of their ultra-high optical nonlinearities and extremely broad transparency window, germanium core fibers offer the possibility of fabricating compact and efficient mid-infrared sources. ...

PURPOSE: To investigate the effectiveness of low-level laser therapy (LLLT) on gastrocnemius muscle morphology and Myod imunoexpression in a model of dorsal burn in rats. METHODS: Sixteen male Wistar rats were distributed into two groups: control group (CG): rats submitted to scald burn injury without treatment and laser treated group (LG): rats submitted to scald burn injury and treated with laser therapy. Fourteen days post-surgery, gastrocnemius muscle was evaluated being the specimens stained with HE and morphometric data was evaluated. MyoD expression was assessed by immunohistochemistry. RESULTS: The results showed that laser treated animals presented more organized tissue morphology compared to the non-treated animals, with a higher number of nucleus in the fibers. Also, the cross sectional area of the fibers and the MyoD immunoexpression in the laser treated groups was higher. CONCLUSION: Low-level laser therapy had positive effects on gastrocnemius muscle, improving tissue muscle ...

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TY - JOUR. T1 - A Randomized Blinded Retrospective Study: the combined use of Micro-needling Technique, Low-Level Laser Therapy and Autologous Non-Activated Platelet-Rich Plasma improves Hair Re-Growth in patients with Androgenic Alopecia. AU - Garcovich, Simone. AU - Gentile, Pietro. AU - Dionisi, Laura. AU - Pizzicannella, Jacopo. AU - De Angelis, Barbara. AU - De Fazio, Domenico. PY - 2020. Y1 - 2020. N2 - Introduction: Mini-invasive therapies based on autologous non-activated Platelet-Rich Plasma (ANA-PRP), Low-Level Laser Therapy (LLL-T), and Micro-Needling Technique (MN-T) used in combining for hair re-growth need to be standardized. Objectives: The work aims to show in vivo outcomes resulted from retrospective case-series study in which ANA-PRP + MN-T + LLL-T were used in combined in patients affected by Androgenic alopecia. Methods: 23 patients were treated, of which 13 males were classified in stage I - V by the Norwood-Hamilton scale, and 10 females were classified in stage I - III by ...

The figure above depicts the s-SNOM setup used in the published work using two different sources, a tunable narrow band quantum cascade laser (QCL) and the synchrotron broadband IR beam. As an innovation brought by the research, the synchrotron setup used a classic symmetric Michelson interferometer for Fourier processing the data as an alternative to the standard asymmetric scheme typically used in s-SNOM. Better SNR related to increased optical power at the sample and higher mechanical stability highlight the instrumental advances of the research. The work explored the interferometric properties of the far-field background arising from tip-sample geometrical scattering and developed a model for retrieving the near-field phase, and consequently the absorption properties, of a variety of samples such as poly(methyl methacrylate) (PMMA), poly(dimethylsiloxane) (PDMS), explosive polymers 1,3,5-trinitroperhydro-1,3,5-triazine (RDX) and pentaerythritol tetranitrate (PETN), and Bovine Serum Albumin ...

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The laser source for television or video display was originally proposed by Helmut K.V. Lotsch in the German Patent 1 193 844.[1] In December 1977 H.K.V. Lotsch and F. Schroeter explained laser color television for conventional as well as projection-type systems and gave examples of potential applications.[2] 18 years later the German-based company Schneider AG presented a functional laser-TV prototype at IFA95 in Berlin/Germany. Due to bankruptcy of Schneider AG, however, the prototype was never developed further to a market-ready product.. Proposed in 1966,[3] laser illumination technology remained too costly to be used in commercially viable consumer products.[4] At the Las Vegas Consumer Electronics Show in 2006, Novalux Inc., developer of Necsel semiconductor laser technology, demonstrated their laser illumination source for projection displays and a prototype rear-projection laser TV.[5] First reports on the development of a commercial Laser TV were published as early as February 16, ...

Effect of low-level laser therapy on the post-surgical inflammatory process after third molar removal PDF Chers amis Les vacan...

TY - JOUR. T1 - Original articles. T2 - The effect of GaAlAs laser irradiation on the recovery process of muscular strength following muscle fatigue. AU - Ishide, Yasushi. AU - Ueda, Fumio. AU - Murayama, Mitsuyoshi. AU - Ohshiro, Toshio. AU - Takenouchi, Kiyofumi. AU - Kohzuma, Mitsuaki. AU - Ohshiro, Takafumi. PY - 2010. Y1 - 2010. N2 - Low reactive-level laser therapy (LLLT) has been reported to reduce chronic and acute pain. Recently, some studies have shown that LLLT may also delay skeletal muscle fatigue during high-intensity exercise. We have hypothesized that laser irradiation may also attenuate muscle fatigue or pain experienced after sports or exercise. However, only a few reports have described the use of lasers in sports medicine. This study was conducted to determine the effectiveness of LLLT in aiding the recovery from exercise-induced skeletal muscle fatigue. Subjects and Methods: Isometric plantar flexion was repeatedly performed on 9 students until the force output declined to ...

Low-level laser therapy (LLLT) is a rapidly growing adjunctive therapy in companion animal practice.. Low-level laser or cold laser therapy is a non-invasive procedure that uses light to stimulate cell regeneration and increase blood circulation, thus helping damaged tissue to repair.. LLLT can be used to treat dogs with arthritis, tendon or soft tissue injuries, and to promote wound healing.. Most lasers are programmable to a range of frequencies in order to treat many different types of problems in dogs.. ...

Acute renal failure has a 50% - 80% mortality rate. Currently, treatment options for this life-threatening disease are limited. Low-level laser therapy (LLLT) has been found to modulate biological activity. The aim of the present study was to investigate the possible beneficial effects of laser application to stem cells in the bone marrow, on the kidneys of rats that had undergone ischemia-reperfusion injury (IRI). IRI was induced by occlusion of the renal artery to 3- and 7-month-old rats for 15 or 30 minutes. In an additional experiment IRI was applied to both kidneys for 20 min each in 2-3-month-old rats. Rats were then divided randomly into two groups of control and laser-treated. Laser therapy (Ga-Al-As 810 nm, 200 mW output for 2 min) was applied to the bone marrow 1 and 7 days post-IRI to the kidneys, and rats were sacrificed 2 weeks later. Histomorphometry and immunohistochemistry were performed on kidney sections and blood markers for kidney function. Quantitative histomorphometric analysis

Results Six patients were diagnosed with sympathetic ophthalmia following treatment with diode laser CPC, an incidence of 0.001% during the study period. Two patients had a history of accidental trauma and all patients had undergone at least one ocular surgery that included a variety of procedures. At presentation, two patients had predominantly posterior segment findings in the sympathising eye, one patient had only anterior segment findings and the rest had panuveitis. All patients were treated with topical and systemic corticosteroids and/or immunosupressive therapy that resulted in complete resolution of inflammation and return to baseline vision in the sympathising eye within 2-48 months of treatment.. ...

References. Iurshin VV, Sergienko NF, Illarionov VE. Etiopathogenetic basis for using magnetolaser therapy in the complex treatment of male infertility. Urologiia. 2003 Mar-Apr;(2):23-5.. Reza Salman Yazdi, Simin Bakhshi, Firooz Jannat Alipoor, Mohammad Reza Akhoond. Effect of 830-nm diode laser irradiation on human sperm motility. Lasers Med Sci (2014) 29:97-104 Ross S. Firestone, Navid Esfandiari, Sergey I. Moskovtsev et al. The Effects of Low-Level Laser Light Exposure on Sperm Motion Characteristics and DNA Damage. Journal of Andrology, Vol. 33, No. 3, May/June 2012. Taha MF, Valojerdi MR. Quantitative and qualitative changes of the seminiferous epithelium induced by Ga. Al. As. (830 nm) laser irradiation. Lasers in surgery and medicine 2004; 34: 352-359. Jin-Chul Ahn, Young-Hoon Kim, Chung-Ku Rhee. The effects of low level laser therapy (LLLT) on the testis in elevating serum testosterone levels in rats. Biomedical Research 2013; 24 (1): 28-32. NM Biswas, R Biswas, NM Biswas and Late H ...

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Seibeth et al describe efficacy and safety using transscleral infrared diode laser peripheral ablation for retinopathy of prematurity (ROP). Conjunctival punctu

Low-level laser therapy uses the healing power of light to provide a potential therapy alternative to medications and surgery. Heres the low-down on how laser therapy works, what it can treat, its potential risks, and how you can track down a laser therapist or a home-use laser unit in your area.

Low-level laser therapy has been used clinically to treat musculoskeletal pain; however, there is limited evidence available to support its use. The current Cochrance review fails to be positive: there are insufficient data to draw firm conclusions on the clinical effect of LLLT for low‐back pain. So, perhaps studies on animals generate clearer answers? The objective […]

In addition to reviewing diagnostic testing for small fiber neuropathy and current treatments, these authors discuss recent study results for low-level laser therapy.

In addition to reviewing diagnostic testing for small fiber neuropathy and current treatments, these authors discuss recent study results for low-level laser therapy.

Cincinnati, OH (PRWEB) September 22, 2016 -- Advanced Cosmetic Surgery and Laser Center, led by Dr. Jon E. Mendelsohn, suggests low-level laser therapy with

Low-Level Laser Therapy. In: Hamm RL. Hamm R.L. Ed. Rose L. Hamm.eds. Text and Atlas of Wound Diagnosis and Treatment New York, NY: McGraw-Hill; . http://accessphysiotherapy.mhmedical.com/content.aspx?bookid=1370§ionid=78436225. Accessed January 16, 2018 ...

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TY - JOUR. T1 - Endoscopic cyclophotocoagulation using iris hooks versus viscoelastic devices. AU - Kahook, Malik Y.. AU - Schuman, Joel S.. AU - Noecker, Robert J.. PY - 2007. Y1 - 2007. N2 - Endoscopic cyclophotocoagulation utilizes a diode laser to ablate ciliary body epithelium, resulting in decreased intraocular pressure. Viscoelastic devices are often used to elevate the iris for improved exposure and efficient treatment of targeted tissue. Occasionally, early postoperative intraocular pressure spikes may occur due to retained viscoelastic material. Iris hooks may provide a safe alternative for elevation of the iris duting endoscopic cyclophotocoagulation treatment and may be particularly advantageous in cases of aphakia or posterior capsule compromise in which viscoelastic removal is made more difficult.. AB - Endoscopic cyclophotocoagulation utilizes a diode laser to ablate ciliary body epithelium, resulting in decreased intraocular pressure. Viscoelastic devices are often used to ...

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Accordingly, the red stain of the collagen fibers was more intense, and they were arranged in a more organized manner in the groups treated with laser, although no statistically significant differences were found (Figures 8 and 9). The expression of the elastic fibers during the 7th and 14th day was very similar. They were present in the neighborhood of the healing fibrous tissue and their visualization in the scar area was minimal. Additionally, a restoration seemed to have occurred of the elastic fiber layer placed below the dermis, since the repair was performed gradually.. The analysis of the healing process in this study was performed until the 14th day after surgery intervention. At this time, the differences between the groups were not as significant as in the previous periods. All the animals exhibited new complete epithelial formation and fibrous healing tissue, devoid of cutaneous attachments.. DISCUSSION. Although the clinical efficacy of the low-power laser has been proved through ...

Michael von Edlinger,1 Julian Scheuermann,1 Lars Nähle,1 Lars Hildebrandt,1,* Marc Fischer,1 Johannes Koeth,1 Robert Weih,2 Sven Höfling,2 and Martin Kamp2 1nanoplus Nanosystems and Technologies GmbH, Oberer Kirschberg 4, 97218 Gerbrunn, Germany 2Technische Physik and Wilhelm-Konrad-Röntgen-Research-Center for Complex Material Systems, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany *Corresponding author: [email protected] ...

When it comes to natural healing in the green consciousness there is a strong movement away from invasive treatments and long-term dependence on pharmaceutical drugs. One effective healing instrument which is commonly used in hospitals in countries like Russia is Low-Level lasers.They have been used for many years in various medical disciplines.. Physiotherapists and sports teams use them regularly for the repair of muscle and joint injuries. Their effectiveness in wound care has also been proven. Every month now, new research is being published confirming the effects of low-level lasers in the successful treatment of more and more medical conditions.. What then are low-level lasers, and how are they being used today to treat medical conditions?Low-level lasers, also known as soft lasers, are medical lasers of such a low power that their effects are to stimulate tissue repair, even in cases of open wounds. In respect of tissue repair, low-level lasers have a wide range of beneficial effects. For ...

We propose to build a compact, rugged airborne laser photoacoustic spectrometric (LPAS) sensor based on a tunable mid-IR diode laser for continuous, real-time measurements of water vapor, and perform field tests to qualify it for dynamic airborne in situ monitoring of upper troposphere water vapor. An innovative diode laser frequency locking technique developed by us will be utilized for tunable diode laser wavelength stabilization. Our sensor will be based on our laboratory LPAS instrument (at technology readiness level TRL-4) that has already demonstrated successful detections of water vapor, chemicals, alcohols, and CWAs. It utilizes a tunable infrared laser (interband cascade or quantum cascade), a high sensitivity photoacoustic cell with an air sampler and an efficient algorithm to rapidly complete high sensitivity, selective multi-component measurements in under a minute. In Phase I we will carry out extensive laboratory tests of LPAS and a comprehensive analysis of the sensor performance ...

The aim of this study was to compare the efficacy and safety of a novel diode system emitting 755 nm wavelength with conventional 755 nm alexandrite laser in skin types III and IV. It was a...

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The |i|Journal of Biomedical Optics|/i| (JBO) publishes peer-reviewed papers on the use of novel optical systems and techniques for improved health care and biomedical research.