What is an excimer laser?
Release time:
2025-10-21
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An excimer laser is a type of laser that is generated when an inert gas mixed with a halogen gas is excited by an electron beam, causing the molecules to transition from an excited state back to their ground state and releasing laser light in the process. This laser belongs to the category of cold lasers and features strong directivity, excellent monochromaticity, high peak output power, and pulsed characteristics. Its wavelength ranges from 157 to 353 nanometers, with relatively high photon energy and a lifetime of about tens of nanoseconds, placing it in the ultraviolet spectral region. Commonly used wavelengths include 193 nm (ArF), 248 nm (KrF), and 308 nm (XeCl).
As a type of ultraviolet laser, it finds wide-ranging applications in industry, medicine, and scientific research, and has demonstrated remarkable efficacy, particularly in ophthalmic treatments. Excimer laser refractive surgery is currently the primary method for vision correction; common procedures include PRK, LASIK, and LASEK, among others.
In ophthalmic applications, an excimer laser is excited by a specially proportioned gas mixture—known as a pre-mixed gas—to produce an invisible ultraviolet beam with a wavelength of 193 nm. This beam features precise focusing and controllability; its photon energy is sufficient to break the molecular bonds in corneal tissue, enabling vaporization and ablation of the tissue. Each pulse can remove tissue to a depth of approximately 0.2 micrometers. With precise computer control, the laser can reshape the corneal curvature, thereby correcting refractive errors. Because the excimer laser is a cold light source, it does not generate thermal effects and has weak penetration, acting only on the surface layer of the cornea without damaging intraocular tissues.
The excimer laser gases produced by KMT have the following characteristics:
• Uses imported fluorine gas;
• Production equipment and technology quality are benchmarked against international industry leaders;
• Possesses a comprehensive cylinder handling mechanism and nationally recognized filling qualifications;
• Its products are recognized and favored by ophthalmic equipment manufacturers both domestically and internationally;
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