excimer laser


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laser

 [la´zer]
a device that transfers light of various frequencies into an extremely intense, small, and nearly nondivergent beam of monochromatic radiation in the visible or invisible spectrum, with all the waves in phase; capable of mobilizing immense heat and power when focused at close range, lasers act on tissues by photocoagulation and photodisruption and are used in surgery, in diagnosis, and in physiological studies.
argon laser a laser with ionized argon as the active medium and with a beam in the blue and green visible light spectrum; used for photocoagulation.
carbon-dioxide laser a laser with carbon dioxide gas as the active medium and that produces infrared radiation at 10,600 nm; used to excise and incise tissue and to vaporize.
excimer laser (excited dimer) a laser with rare gas halides as the active medium, used in ophthalmological procedures and angioplasty. The beam is in the ultraviolet spectrum and penetrates tissues only a small distance; it breaks chemical bonds instead of generating heat to destroy tissue.
holmium:YAG laser a laser whose active medium is a crystal of yttrium, aluminum, and garnet doped with holmium ions, and whose beam is in the near infrared spectrum at 2100 nm; used for photocoagulation and photoablation.
neodymium:yttrium-aluminum-garnet (Nd:YAG) laser a laser whose active medium is a crystal of yttrium, aluminum, and garnet doped with neodymium ions, and whose beam is in the near infrared spectrum at approximately 1060 nm; used for photocoagulation and photoablation.

excimer laser

laser used particularly for refractive procedures, consisting of photons in the ultraviolet spectrum emitted by unstable dimers of argon and fluoride.
[excited dimer]

excimer laser

Cold laser Cardiology A laser used in coronary artery angioplasty that delivers pulsating UV light to excise atherosclerotic plaques in stenosed arteries. Cf Percutaneous transluminal coronary angioplasty Ophthamology ELs may be used to vaporize part of the surface layer of the cornea.

ex·ci·mer la·ser

(ek'si-mĕr lā'zĕr)
Laser used particularly for refractive procedures, consisting of photons in the ultraviolet spectrum emitted by unstable dimers of argon and fluoride.
[excited dimer]

excimer laser

An argon fluoride laser operating in the ultraviolet part of the spectrum and producing a beam that can remove layers of tissue only a few thousands of a millimetre thick.

Excimer laser

An instrument that is used to vaporize tissue with a cold, coherent beam of light with a single wavelength in the ultraviolet range.
References in periodicals archive ?
The combined use of drug-eluting balloon and excimer laser for coronary artery restenosis in-stent treatment: The DERIST study.
For this work, 7000 Series Exitech of 20 ns pulse krypton fluoride (KrF) excimer laser ([lambda] = 248 nm) was used which could deliver up to 250 mJ/pulse.
At this stage, The Excimer Laser was emitted to surface of Bowman's membrane and the anterior stroma, and then Mitomycin C solution based on the amount of refractive error was put on the eye and finally washed with sterile water and the band aged contact lens was put on the eye for five days.
Highly automated, the modern excimer laser is controlled by a computer specifically programmed by the ophthalmologist for each patient's refractive error or corneal condition.
The recently published papers on LASEK using excimer laser in hyperopes and myopes have shown refractive stability between 6 months and 12 months.
AlSb Pallets were irradiated with 500,1000,1500, and 2000 KrF Excimer laser shots (248 nm, 25 mJ,20 ns) employing a UV transmission lens placed outside the chamber a UV window port.
In the present study, we retrospectively investigated the therapeutic safety and efficacy of excimer laser PTK for the treatment of 47 consecutive cases of patients with fungal keratitis of the anterior stroma.
In addition to Axcelis Technologies, Braun is a member of the board of directors at Cymer Inc, a supplier of excimer laser light sources used in deep ultra-violet photolithography systems.
With the Excimer laser there is no need for further surgery.
TPV has also developed an entirely new corneal approach to treating presbyopia with an excimer laser, known as SUPRACOR(tm).
To address this problem an excimer laser sheaths was developed by the Spectranetics Corporation (Colorado Springs, Colorado) to be incorporated into the system of traction-counter traction for removal of chronically implanted leads (4).
Islets were placed on an excimer laser optic chip, examined using a Horiba Jobin Yvon HR 800 Confocal Raman Spectrometer, and scanned using a He-Ne 635 nm laser.