Distributed resonant cavity light beam modulator

Details Distributed resonant cavity light beam modulator Distributed resonant cavity light beam modulator

1991-02-01

1992-10-20

LaRoche, Eugene R.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359248, 359586, 359563, 359589, 385 3, 385 37, 372 96, G02F 107, G02F 1035, G02B 2744, G02B 110

Patent

active

051575370

ABSTRACT:
An optical apparatus consisting of a laser for producing a coherent polarized beam of electromagnetic radiation of a preselected wavelength. A substrate of silicon has a first transparent cover layer for receiving the polarized beam substantially normally incident thereto, an a second transparent guide layer for receiving the polarized beam from said first layer and for supporting at least one resonant mode. The first and second layers have a preselected index of refraction and a grating is interposed between them, having a grating period less than half the preselected wavelength. The layers and grating interact to produce a standing wave resonance by Bragg reflection. A control obtains a resonance wavelength in the guide layer equal to the predetermined radiation wavelength and thereby high reflectance to modulate the polarized beam.

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