Patent ID: 7408963

Claim:
A medical laser apparatus capable of selectively irradiating a plurality of visible laser beams each having a different wavelength onto an affected part, comprising: an excitation light source; a first fiber laser being made of an yttrium glass fiber and being connected to the excitation light source, an input end of the first fiber laser being formed with a fiber Bragg grating; an optical switch having an input portion being connected to the first fiber laser, and a plurality of output portions; a plurality of second fiber lasers being made of an yttrium glass fiber and being connected to the output portions of the optical switch, an output end of each of the second fiber lasers being formed with a fiber Bragg grating, wherein the first fiber laser and the second fiber lasers oscillate, by means of excitation light from the excitation light source, a plurality of infrared fundamental beams each having a different wavelength, the first fiber laser and one of the second fiber lasers oscillate an infrared fundamental beam having a wavelength of 1160 nm to 1200 nm; and a plurality of wavelength conversion elements for wavelength-converting the infrared fundamental beams, from the first and second fiber lasers to a plurality of visible second harmonic beams each having a different wavelength, wherein one of the wavelength conversion elements wavelength-converts the infrared fundamental beam having the wavelength of 1160 nm to 1200 nm to an orange second harmonic beam having a wavelength of 580 nm to 600 nm.