• argon
  • The disclosed method involves the use of pulsed laser energy from an argon-ion laser to destroy the tissue of luminal occlusions, such as atheromatous plaque and the like, with substantially. (google.es)
  • An excimer laser typically uses a combination of a noble gas (argon, krypton, or xenon) and a reactive gas (fluorine or chlorine). (wikipedia.org)
  • An excimer laser typically uses a mixture of a noble gas (argon, krypton, or xenon) and a halogen gas (fluorine or chlorine), which under suitable conditions of electrical stimulation and high pressure, emits coherent stimulated radiation (laser light) in the ultraviolet range. (wikipedia.org)
  • An argon fluoride laser absorbs energy from a source, causing the argon gas to react with the fluorine gas producing argon monofluoride, a temporary complex, in an excited energy state: 2 Ar + F 2 → 2 ArF The complex can undergo spontaneous or stimulated emission, reducing its energy state to a metastable, but highly repulsive ground state. (wikipedia.org)
  • irradiation
  • 8. Apparatus according to either claim 1 or claim 2 wherein the irradiation means is a laser. (google.com)
  • The instrument includes improvements in ion optics, microchannel plate detectors, laser irradiation of samples, and preparation of samples for measurement. (google.com)
  • Laser desorption ionization mass monitoring is a TOF mass monitoring method wherein charged molecules of a species to be measured, or analyzed, are produced by laser irradiation (in a vacuum) of a crystalline host matrix including a small proportion, for example between about 1:1000 and 1:10,000 of the species. (google.com)
  • 1960
  • The first laser was built in 1960 by Theodore H. Maiman at Hughes Research Laboratories, based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow. (wikipedia.org)
  • radiation
  • A laser system for reprofiling a surface, such as the corneal surface of an eye, comprising a laser and a photoreactive mask disposed between the laser means and the surface for providing a predefined profile of resistance to laser radiation, such that, upon irradiation of the mask, a portion of the. (google.com)
  • In one preferred embodiment, the mask includes a transparent matrix and light-absorbing dispersoids selectively distributed within the matrix, such that the dispersed elements are progressively bleached by exposure to the laser radiation. (google.com)
  • The beam-shaping mask can include either an aperture e.g., a beam-shaping stop means alone or in combination with a beam-shaping window, or an mask which is erodible or otherwise graded in its absorptive capacity to present a predefined profile of resistance to the laser radiation. (google.co.uk)
  • 4. The method of claim 1 further comprising the step of disposing a beam shaping means between the laser means and the cornea for varying a size of the beam of laser radiation incident upon the masking means and thereby selectively ablating and reshaping the cornea. (google.co.uk)
  • 6. A method according to claim 4 in which the size of the area exposed to and eroded by the pulses of laser radiation is varied in a controlled manner by varying the beam size. (google.co.uk)
  • Consequently, the chemical and biological effects of UV are greater than simple heating effects, and many practical applications of UV radiation derive from its interactions with organic molecules. (wikipedia.org)
  • A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. (wikipedia.org)
  • In this usage, the term "light" includes electromagnetic radiation of any frequency, not only visible light, hence the terms infrared laser, ultraviolet laser, X-ray laser, gamma-ray laser, and so on. (wikipedia.org)
  • selectively
  • aiming means arranged within the sheath of said catheter means for shifting the distal end of said fiber means relative to said sheath and the longitudinal axis of the catheter means whereby said laser beam is selectively aimed to impinge upon different points on the obstruction. (google.es)
  • corneal
  • 9. The method of claim 7 wherein the method further comprises locating the laser means and the masking means in optical alignment with corneal tissue, and then irradiating the masking means to selectively erode the corneal tissue. (google.com)
  • At the Illinois Eye and Ear Infirmary, Peyman, because of his interest in the effects of lasers on tissues in the eye, began evaluating the potential use of a CO2 laser to modify corneal refraction in rabbits. (wikipedia.org)
  • pulse
  • laser means arranged adjacent the proximal end of said catheter means for generating a non-continuous wave, pulsed laser beam having a predetermined pulse duration, pulse repetition rate, pulse energy and duty cycle selected to effect damage to the obstruction with substantially no thermal necrosis of the surrounding tissue of the body lumen. (google.es)
  • Excimer lasers are usually operated with a pulse repetition rate of around 100 Hz and a pulse duration of ~10 ns, although some operate at pulse repetition rates as high as 8 kHz and some have pulsewidths as large as 30 ns. (wikipedia.org)
  • It was also determined that: 1) the deposited films were stable and extremely adherent to the substrate, 2) silicone deposition exhibited an 'incubation effect' which led to the film properties changing with laser pulse number and 3) films deposited under high vacuum were similar to films deposited at low vacuum levels. (ufl.edu)
  • 5. The angioplasty system of claim 1 wherein each pulse of said laser energy comprises a sequence of time shifted subpulses. (google.com)
  • microwave
  • These groups include the Avco Everett Research Laboratory, Sandia Laboratories, the Northrop Research and Technology Center, and the United States Government's Naval Research Laboratory who also developed a XeCl Laser that was excited using a microwave discharge. (wikipedia.org)
  • thus
  • Thus the ArF and other excimer lasers have the useful property that they can remove exceptionally fine layers of surface material with almost no heating or change to the remainder of the material which is left intact. (wikipedia.org)
  • beams
  • The light emitted by the ArF is invisible to the human eye, so additional safety precautions are necessary when working with this laser to avoid stray beams. (wikipedia.org)
  • According to another aspect, a second laser source is provided along with a galvanometer for directing each of two laser beams to a surface to be treated. (google.co.uk)
  • Laser beams can be focused to very tiny spots, achieving a very high irradiance, or they can have very low divergence in order to concentrate their power at a great distance. (wikipedia.org)
  • There are some lasers that are not single spatial mode and consequently have light beams that diverge more than is required by the diffraction limit. (wikipedia.org)
  • emit
  • Lasers can also have high temporal coherence, which allows them to emit light with a very narrow spectrum, i.e., they can emit a single color of light. (wikipedia.org)
  • experimental
  • Peyman performed a number of experimental studies evaluating the effect of various excimer lasers in collaboration with Physics Department of the University of Helsinki, Finland. (wikipedia.org)
  • invention
  • A further embodiment of the catheter of the invention provides an array of laser fibers which are optically scanned with laser energy to cover the cross-sectional area of the lumen. (google.es)
  • system
  • A flexible catheter and associated laser microsurgical system is also disclosed which provides for aiming of the fibers to transmit the laser beam at the distal end of the catheter and rotational positioning of the catheter to permit coverage of virtually the entire cross-sectional area of the lumen. (google.es)
  • A lens system at the distal end of each laser fiber minimizes beam divergence and directs the beam toward the central axis of the catheter. (google.es)
  • Recently, through the use of a novel diffractive diffuse system composed of two microlens arrays, surface micromachining by ArF laser on fused silica has been performed with submicrometer accuracy. (wikipedia.org)
  • The system can also include a feedback control for measuring the effectiveness of the laser during operation and for controlling the laser such that the reprofiling operation is substantially confined to the Bowman's membrane throughout the procedure. (google.co.uk)
  • tissue
  • d. means for alternately selecting between aperture sizes within the member to optimize the first laser beam with respect to tissue interaction characteristics of the first laser beam. (google.co.uk)
  • properties
  • The studies reported here showed that the deposited silicone film properties had a dependence on the laser energy density incident on the target. (ufl.edu)
  • wherein
  • 2. The method of claim 1 wherein the ablating step includes the step of laser ablating the electrically conductive material. (google.es)
  • method
  • However, all such devices are classified as "lasers" based on their method of producing light, i.e., stimulated emission. (wikipedia.org)
  • various
  • They have been used to determine the concentration of various analytes from biological samples, particularly from blood. (google.es)
  • range
  • Under the appropriate conditions of electrical stimulation and high pressure, a pseudo-molecule called an excimer (or in the case of noble gas halides, exciplex) is created, which can only exist in an energized state and can give rise to laser light in the ultraviolet range. (wikipedia.org)
  • surface
  • The mask can be connected to the support structure and disposed in optical alignment with the laser means and the surface. (google.com)
  • high
  • Excimer lasers are widely used in high-resolution photolithography machines, one of the critical technologies required for microelectronic chip manufacturing. (wikipedia.org)
  • rather
  • A laser that produces light by itself is technically an optical oscillator rather than an optical amplifier as suggested by the acronym. (wikipedia.org)
  • substantially
  • An aperture member positioned between the laser crystal and one of the reflective surfaces includes a substantially circular. (google.co.uk)
  • source
  • According to an another aspect, the aperture for a single laser source is rapidly changed during the performance of a procedure. (google.co.uk)
  • light
  • A laser differs from other sources of light in that it emits light coherently, spatially and temporally. (wikipedia.org)
  • Lasers are distinguished from other light sources by their coherence. (wikipedia.org)
  • Lasers are employed in applications where light of the required spatial or temporal coherence could not be produced using simpler technologies. (wikipedia.org)
  • further
  • deriving a feedback control signal from such comparison to provide further control for the laser means. (google.co.uk)
  • optical
  • With the widespread use of the original acronym as a common noun, optical amplifiers have come to be referred to as "laser amplifiers", notwithstanding the apparent redundancy in that designation. (wikipedia.org)
  • Play media A laser consists of a gain medium, a mechanism to energize it, and something to provide optical feedback. (wikipedia.org)
  • time
  • This was very exciting information, but, unfortunately, Peyman did not have access to this laser, which at the time was new and very expensive. (wikipedia.org)