| 摘要 |
PROBLEM TO BE SOLVED: To provide a laser resonator which can oscillate in a single mode, can be reduced in size and number of item parts, can be simplified in structure, and can make wavelength selection over a wide range. SOLUTION: A laser oscillator consists of a rear mirror 11 and an output mirror 16 respectively having reflecting surfaces S1 and S6 faced to each other and first and second transmitting members 12 and 14, which are arranged between the mirrors 11 and 16 with a fixed interval D inbetween and transmit light. At least either one the members 12 and 14 is formed as a laser medium, and the end faces S3 and S4 of the members 12 and 14 facing the interval D are formed as partially reflecting surfaces between which an etalon is constituted. The laser resonator is provided with an interval adjusting device 18, which changes the interval D by moving at least either one of the members 12 and 14 in the direction of the optical axis, so as to have the oscillation wavelength of the resonator changed.
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