Optically stable, large time bandwidth acousto-optic heterodyne

Details Optically stable, large time bandwidth acousto-optic heterodyne Optically stable, large time bandwidth acousto-optic heterodyne

1990-09-14

1991-07-02

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

350358, 356346, G01R 2316

Patent

active

050288644

ABSTRACT:
A common-path interferometric acoustic-optic heterodyne spectrum analyzer ving high immunity to ambient vibration uses two, counter-propagating beams, two Bragg cells for beam diffraction, a series of waveplates and a birefringent quartz wedge. Proper light polarization with the waveplates and Bragg cell geometry allows one Bragg cell to diffract primarily the clockwise beam and the other Bragg cell to diffract the counterclockwise beam. The birefringent quartz wedge shifts the diffracted beams to provide a heterodyne signal with a non-zero IF carrier frequency. The analyzer is highly angle compensated and alignment stable when components are disturbed in position or orientation.

REFERENCES:
patent: 4531196 (1985-07-01), Lin
patent: 4644267 (1987-02-01), Tsui
patent: 4725774 (1988-02-01), Davis

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