Patent ID: 7008414

Claim:
A laser treatment apparatus comprising: a laser apparatus, including: a laser light generating device having a solid-state laser that generates laser light of a specified wavelength, a light amplifier that amplifies the laser light generated by the laser light generating device, a wavelength converter which uses a nonlinear optical crystal to convert the laser light amplified by the light amplifier into treatment laser light with a wavelength of approximately 193 nm, and an irradiation optical device which delivers the treatment laser light generated by the laser apparatus to a treatment site, and irradiates the treatment site with the treatment laser light, wherein the solid-state laser comprises a DFB semiconductor laser or fiber laser that has an oscillation wavelength in the range of 1.51 μm to 1.59 μm, and the wavelength converter converts the laser light from the solid-state laser into an octuple harmonic that is in the range of 189 nm to 199 nm.