Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1990-07-18
1992-10-06
LaRoche, Eugene R.
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359290, 359579, 372 13, G02F 111, G02B 2600, G02B 2700, H01S 3117
Patent
active
051537710
ABSTRACT:
A acousto-optic Fabry-Perot optical modulator (10) has a crystalline body (12) having a first partially reflective electrode (14) for receiving radiation, including laser radiation having a wavelength or wavelengths of interest, and a second, oppositely disposed partially reflective electrode (14) for emitting the received radiation including the laser radiation. The modulator is driven by an alternating source (16) at a resonant frequency of the crystalline body and intensity modulates at the resonant frequency only the emitted laser radiation. A detector (18) is positioned for receiving the emitted radiation, including the intensity modulated laser radiation, and has an output signal expressive of the intensity of the emitted radiation. Signal processing circuitry (20,34) is coupled to the detector output signal and is responsive thereto for identifying the intensity modulated laser radiation for indicating when laser radiation is received by the modulator.
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Lang Paul D.
Link Charles A.
Anderson Terry J.
Block Robert B.
LaRoche Eugene R.
Lester Evelyn A.
Northrop Corporation
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