Standing wave forma surface acoustic wave optical modulation device

摘要

PURPOSE:To provide modulated light which flickers with high efficiency by laminating surfaces for generating surface acoustic waves (SAW) apart at nearly a parallel spacing in the optical axis direction of incident light and disposing plural acoustic wave generators in such a manner that the progressing directions of the SAW are reversed. CONSTITUTION:Plural pieces of base materials 1a, 1b, 1c having the optical planes in which the SAWs propagate on the front and rear are disposed to face each other apart at nearly the parallel spacing and the acoustic wave generators 2a, 2b are interposed in the spacing between these base materials so that acoustic oscillations propagate in the form of the SAWs having the same frequency and the same phase in the same direction in the two optical planes sandwiching the generators 2a, 2b. The positions of plural pieces of the acoustic wave generators are so set that the SAWs between the two groups are reversed in the direction only in the progressing direction and intersect with each other spacially in the light transmission regions on the SAW propagation base materials. The intermittent phase modulation function at a high frequency is thereby permitted.