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

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