Distributed resonant cavity light beam modulator

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

1992-10-20

1994-08-09

Ben, Loha

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359245, 359563, 359586, 359589, 372 96, 385 3, 385 37, G02F 107, G02F 1035, G02B 2744, G02B 110

Patent

active

053371836

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, and a second transparent guide layer for receiving the polarized beam from the 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. The grating can be optimized for angular bandwidth by controlling the grating's Fourier components either in a single layer or in two grating layers which can also include a termination.

REFERENCES:
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