The so-called excimer laser refers to the laser produced by excited dimers. It is called an excimer because it is not a stable molecule. It is a fleeting molecule that was once formed in a series of physical and chemical reactions caused by the laser mixed gas being exposed to external energy. Its lifespan is only a few dozen. Nanosecond, excimer laser is a kind of pulse laser, which generates laser with different wavelengths because the resonant cavity is filled with different mixtures of rare gases and halogen gases. The wavelength range is 157-353nm.
The working gas used in laser refractive corneal surgery is ArF, which produces a 193nm excimer laser, which is an ultraviolet light wave. When each laser beam hits the tissue, it can vaporize the tissue molecules, so it is accurate The intensity is very high, and because it is a cold laser, it does not produce a thermal effect on the tissue next to the irradiated part. With this accurate vaporization, a layer of the cornea can be accurately cut off, but it does not affect the structure of the cornea. No adverse effects.
