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Philosophical Transactions of the Royal Society of London Series A Mathematical and Physical Sciences

Guided-wave controlled etalons

Dror Sarid

Published Dec 18, 1984• 0 citations
Publisher

Abstract

Abstract Optical bistability in a nonlinear Fabry-Perot etalon can be controlled by several optical beams injected through the edges of the etalon. The control beams, which propagate transversely in the etalon, modify the refractive index, which in turn switches the etalon between its two stable states. The theory of operation of the device is presented, possible logical operations are discussed and experimental results from using an InSb etalon and a CO laser are reported.

DOI
10.1098/rsta.1984.0121

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Abstract Optical bistability in a nonlinear Fabry-Perot etalon can be controlled by several optical beams injected through the edges of the etalon. The control beams, which propagate transversely in the etalon, modify the refractive index, which in turn switches the etalon between its two stable states. The theory of operation of the device is presented, possible logical operations are discussed and experimental results from using an InSb etalon and a CO laser are reported.
This article describes the application of one type of optical bistable device based on gallium arsenide as the nonlinear medium. The authors discuss several possible operations with GaAs nonlinear Fabry-Perot etalons. This article utilizes a recently developed computer model to illustrate the basic operating principles and applications. The authors mainly concentrate on the device operation itself. In keeping with common practice they use the term optical bistable device when referring to a device that can exhibit optical bistability even when not being used in such a manner. Instead of the expression nonlinear Fabry-Perot etalon, they often use nonlinear etalons or etalon devices.
Optical bistability can be obtained in nonlinear materials either with Fabry-Perot mirrors or without external feedback. When a material is placed between partially reflecting mirrors, a nonlinear Fabry-Perot etalon is formed with the etalon providing an external feedback. Optical bistability and gating occur as a result of a shift in the Fabry-Perot peak when the light intensity is increased (or when a second laser beam is introduced into the cavity). Optical bistability with the external feedback mechanism has been observed in many semiconductors such as bulk GaAs, GaAs-AIGaAs multiple-quantum-well (MQW) structures, InSb, InAs, CdS, CdHgTe, GaSe, and CuCI.