| 摘要 |
A solid laser apparatus has either a combination of a lowpass filter ( 9 c) and a highpass filter ( 9 d) or a bandpass filter 9 f provided in its output control circuit (8, 9, 10) for increasing the gain and adjusting the phase of a signal in the vicinity of the relaxation oscillating frequency. Also, a solid laser apparatus has the phase shift circuit ( 9 g) provided in its output control circuit ( 8,9,10 ) for advancing the phase of a signal in the vicinity of the relaxation oscillating frequency thereof. Moreover, a solid laser apparatus has a pseudo notch filter ( 9 h), which is arranged for the gain to have a local minimum at the relaxation oscillating frequency of the solid laser apparatus, provided in the output control circuit ( 8,9,10 ) so that the peak of the gain transmission characteristic of the nonlinear optical device ( 4 ) or of a combination of the nonlinear optical device ( 4 ) and the microchip laser crystal ( 3 ) is offset.
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