| 摘要 |
PURPOSE:To realize the stabilization of an optical output by disposing a piezoelectric concave lens system, continuously compensating a thermal lens effect and holding an optimum resonant state. CONSTITUTION:Focal lengths of piezoelectric concave lenses 2, 4 are varied in response to an output power from a resonator formed of a rear mirror 1, the lens 2, a laser rod 3, the lens 4, and front mirror 5, and so composed as to hold an optimum resonant state. A piezoelectric material employs a piezoelectric lens of a PLZT transparent material to spectrally separate a light by the shape change of the lens. That is, the light incident to the mirror 1 is distributed to lights having different frequencies and low energy lights, matched under phase matching conditions by an optical resonator 3, the focal length is condensed by the lens 4, and a coherent light of necessary frequency can be output by the optical filter 5. |
