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Acousto-optic tunable filter and method of calculating its equivalence incident angle
Acousto-optic tunable filter and method of calculating its equivalence incident angle
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机译:声光可调滤波器及其等效入射角的计算方法
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摘要
In a non-collinear type acousto-optic tunable filter, the incident angle of a source light beam L.sub.1 radiated from a light source 6 onto an acoustic medium 1 is set at an equivalence incident angle for which the wavelength &lgr;.sub.i of the diffracted ordinary ray L.sub.3 and the wavelength &lgr;.sub.i ' of the diffracted extraordinary ray L. sub.4 become approximately identical. Further, the diffracted ordinary ray L.sub.3 and the diffracted extraordinary ray L.sub.4 of the approximately identical wavelength are superposed, and the intensity of the superposed ray is detected. Consequently, spectrometry is performed based on the superposed diffracted ray having twice the intensity and a very sharp waveform, so that accurate spectroscopy can be made possible even if the intensity of the source light beam is low.
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