| 摘要 |
<p>An optical device of this invention is such that complicated adjustment of the arrangement is not needed unlike a conventional optical device for outputting light having a frequency different from that of the input light by means of a nonlinear optical crystal. Electrodes (12A and 12B) for Q-switching, electrodes (9A and 9B) for phase adjustment and a periodical domain inversion portion (15) are disposed at predetermined positions in path (2) inside an optical crystal body (1) having nonlinear optical properties, electro-optical properties and laser activity. Oscillation light (P1) is produced by inputting light (P0) given from the input side (3), and output light (P2) having a frequency different from the frequency of the input light (P0) is outputted from the output side (4) by the nonlinear optical property and by the generation of harmonic or by optical parametric oscillation by use of the periodical domain inversion portion (15). The refractive index of the part of nonlinear crystal body (1) between the phase adjustment electrodes (9A and 9B) is changed by changing the voltage between the electrodes (9A and 9B), and the frequency of resonance over the full length (Lt) of the path (2) is thus adjusted. The Q-switching of oscillation light (P) is conducted by changing the refractive index of an oblique crossing portion of the oblique side (G) of the electrode (12A) and the path (2) by changing the voltage between the Q switch electrodes (12A and 12B). <IMAGE></p> |
