| 摘要 |
PURPOSE:To simplify the structure of an incident mirror and an emitting mirror, and to make manufacturing easy by setting a reflection factor to the oscillation light of the incident mirror and the emitting mirror, to a specific value. CONSTITUTION:Laser oscillation and excitation light 7 by a pulse oscillation type Nd-YAG laser 1, and mirrors 5, 6 is made incident on a collimator lens 10, an incident mirror 11 of a dielectric multi-layer vapor-deposited film, a non-linear optical crystal 13 for varying the wavelength of an emitting layer by controlling a turning incident angle, and an optical parametric oscillator 8 provided with the same emitting mirror 14 as the mirror 11, and an oscillation light 15 whose wavelength is variable is emitted. A reflection factor to the oscillation light of these mirrors 11, 14 is set to a small value of about 50% and the transmittivity becomes larger remarkably, the number of layers of the dielectric multi-layer vapor-deposited film can be decreased remarkably to 10 layers, etc., the structure of the incident mirror and the emitting mirror is simplified and they can be manufactured easily. |
