Acousto-optic tunable filter and method of calculating its equiv

Details Acousto-optic tunable filter and method of calculating its equiv Acousto-optic tunable filter and method of calculating its equiv

1997-12-23

1999-10-26

Epps, Georgia

Optical: systems and elements

Optical modulator

Light wave directional modulation

359285, 359313, 359314, 356328, G02F 133

Patent

active

059738227

ABSTRACT:
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 .lambda..sub.i of the diffracted ordinary ray L.sub.3 and the wavelength .lambda..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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patent: 5131742 (1992-07-01), Schaff
patent: 5576880 (1996-11-01), Chang

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