| 摘要 |
PROBLEM TO BE SOLVED: To remove the complicatedness of an optical system and to relax restrictions on its use environment by making the output light of a narrow-band semiconductor laser incident on an optical parametric resonator(OPO resonator) in addition to a pump wave. SOLUTION: The laser light from a pump laser 1 is inputted to the OPO resonator 10, which performs laser oscillation by utilizing the parametric effect of nonlinear crystal NOC to obtain signal light S and idler light I. In addition to the OPO resonator 10, the narrow-band semiconductor laser 11 is provided which has, for example, relaxed usable temperature variation of±5 deg.C and is superior in stability. The narrow-band semiconductor laser 11 oscillates the same wavelength as the oscillation wavelengthλ2 orλ3 of the signal light S or idler light I by the OPO resonator 10 and the laser light is made incident on the OPO resonator 10 to equalize the oscillation wavelengthλ2 orλ3 in the resonator 10 to the wavelength of the narrow-band semiconductor laser 11, thereby narrowing down the oscillation wavelength of the OPO resonator 10.
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