Optical: systems and elements – Optical modulator – Light wave directional modulation
Patent
1992-07-02
1993-11-23
Lerner, Martin
Optical: systems and elements
Optical modulator
Light wave directional modulation
359309, 359313, 359568, 359615, G02F 133, G02B 504
Patent
active
052649571
ABSTRACT:
The optical device can examine a spectrum at low resolution and subsequently choose a portion of that spectrum to be examined at higher resolution, using a single detector array for both spectra. The latter spectrum can be chosen to be arbitrarily anywhere within the low resolution spectrum. The device comprises a source of input light, a wedged shaped dispersive device, a first reflective mirror, a second reflective mirror, a RF generator connected to the dispersive device, and a detector array. In operation, the dispersive device provides a low dispersion spectrum in the zero order light when the source of light is impinged upon it. When the RF generator is turned on, a second spectrum which is diffracted is obtained. This will be the high resolution spectrum. By operating near 100% diffraction efficiency, it is possible to switch from one spectrum to the other. By adjusting the RF frequency the band center of the high resolution spectrum can be varied to fall anywhere within the low resolution spectrum. Since the two spectra will not normally physically fall in the same place, the zero order spectrum is reflected by a first mirror onto the detector array and the diffracted spectrum is reflected by a second mirror on to the detector array so that the two spectra overlay and fall in the same detector array.
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Gottlieb Milton S.
Melamed Nathan T.
Franz Bernard E.
Kundert Thomas L.
Lerner Martin
Lester Evelyn A.
The United States of America as represented by the Secretary of
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