Wenderoth, Lind & Ponack, L.L.P.
Optical device
 The object of the present invention is to provide an optical device which has obliterated, by the use of a nonlinear optical crystal, the need for a complicated adjustment operation of positions as seen in an optical device used for obtaining an output light having a frequency different from an input light. To be specific, Q switching electrodes 12A, 12B, phase adjustment electrodes 9A, 9B and periodic domain inversion part 15 are disposed in desired parts of path 2 in an optical crystal 1 having nonlinear optical character, electro-optical character and laser activity. By the action of an input light P0 supplied from an input side 3, oscillation light P1 is oscillated, harmonic is generated by nonlinear optical character and periodic domain inversion part 15, or output light P2 having a frequency different from that of input light P0 is emitted from output side 4 by optical parametric oscillation. As a result of changes in voltage between phase adjustment electrodes 9A, 9B, the refractive index of the corresponding part of the nonlinear crystal 1 is changed to adjust the oscillation frequency by to total length Lt of path 2. By changing voltage between Q switching electrodes 12A, 12B, a refractive index of slanting intersection of oblique side G of electrode 12A and path 2 can be changed to effect Q switching of oscillation light P1. 
Mitsubishi Cable Industries, Ltd.
G H H H G H H
G02F H01S H01S H01S G02F H01S H01S
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Hiromasa
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