| 摘要 |
PROBLEM TO BE SOLVED: To emit laser lights of plural different wavelengths efficiently at a low cost by selecting the laser beams so that one or two laser beams among first, second, and third beams may be guided to an object. SOLUTION: A laser oscillator 10 is provided inside with Nd:YAG crystals 11a, 11b which are solid-state laser media, semiconductor lasers 12a, 12b which are exciting light sources, nonlinear crystals 13a-13c which are wavelength converters, total reflection mirrors 14a-14g, dichroic mirrors 15a-15d, and mirrors 16a-16e. The Nd:YAG crystals emit lights, having plural oscillation beams in the near infrared wavelength range by being excited by an excitation light from the exciting light sources. Here, among these oscillation beams, utilizing those having wavelengths of about 1,064 nm and 1,319 nm which have the high output and can be converted into different colors are used to emit laser lights having wavelengths of about 532 nm (green), about 589 nm (yellow), and about 659 nm (red). An optical resonance cavity on the rod 11a side emits a light of 1,063 nm wavelength, and one on the rod 11b side emits a light of 1,319 nm wavelength. |
