| 摘要 |
PURPOSE:To obviate inconvenience and restriction for mounting and operation by demultiplexing a light beam into two optical paths, allowing each of them to pass through each separate acoustooptical medium, returning them to one optical path again by a deflecting beam splitter, and allowing it to be made incident on an emitted light use polarization plane maintaining optical fiber, etc. CONSTITUTION:When the frequency of incident light, and frequencies of ultrasonic waves for emitting a light beam in two acoustooptical mediums 1, 1' are denoted as f0, and f1, f2, respectively, when the propagation direction of the incident light goes away from a generation source of the ultrasonic wave against an axis in the propagation direction of the ultrasonic wave, the frequency of the emitted light goes to f0-f1, f0-f2, and when said direction approaches the generation source of the ultrasonic wave, the frequency of the emitted light goes to f0+f1, f0+f2. Two laser light beams (f0+ or -f1, f0+ or -f2) whose frequencies are shifted by two acoustooptical mediums 1, 1' have the polarized light direction, respectively, multiplexed to one light beam by polarized light beam splitters 6, 6', led to an emitted light use fiber 8, etc., and an optical path conversion such as demultiplexing and multiplexing, etc. can be executed in one housing 3 through an optical fiber, etc. In such a way, a light frequency shifter can be formed compactly, and non-adjustment of the optical axis alignment can be realized.
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