Patent ID: 7003001

Claim:
A medical laser apparatus comprising: a solid laser oscillating source which emits a beam of a wavelength λ 1 in an infrared region of approx. 1040 nm to approx. 1080 nm; a first fiber-based Raman shifter including a first Raman fiber which generates, when receives the λ 1 -beam from the laser oscillating source, a first-order Stokes beam of a wavelength λ 2 different from the wavelength λ 1 by stimulated Raman scattering, the first Raman fiber being formed with a pair of fiber Bragg gratings which forms a resonator for the λ 2 -beam; a first nonlinear crystal which wavelength-converts the λ 2 -beam outputted from the first Raman wavelength shifter to a second harmonic beam of a wavelength λ 2 ′ in an orange region of approx. 580 nm to approx. 600 nm; and a light guiding optical system which guides the λ 2 ′-beam to a treatment part.