文件名称:
Double-pass acousto-optic modulator system
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上传时间: 2011-05-13
详细说明： 双次通过声光调制器系统设计 REVIEW OF SCIENTIFIC INSTRUMENTS 76, 063112 s2005d A practical problem that arises when using acousto-optic modulators sAOMsd to scan the laser frequency is the dependence of the beam diffraction angle on the modulation frequency. Alignment problems with AOM-modulated laser beams can be effectively eliminated by using the AOM in the double-pass configuration, which compensates for beam deflections. On a second pass through the AOM, the beam with its polarization rotated by 90° is deflected back such that it counterp ropagates the incident laser beam and it can be separated from the input beam with a polarizing beam splitter. Here we present our design for a compact, stable, double-pass AOM with 75% double-pass diffraction efficiency and a tuning bandwidth of 68 MHz full width at half maximum for light transmitted through a single-mode fiber. The overall efficiency of the system sdefined as the optical power out of the single-mode fiber divided by the optical power into the apparatusd is 60%. ...展开收缩
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