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Applied Physics Letters

A bistable Fabry-Perot resonator

P. W. E. Smith, E. H. Turner

Published Mar 15, 1977• 151 citations
Publisher

Abstract

We propose and demonstrate the operation of a novel bistable optical device that exhibits differential gain and can function as an optical switch, limiter, or optical memory element.
DOI
10.1063/1.89367

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When the output parameter of an optical device could be a multivalued function of the input parameter, this device can be working in an optical bistable status. The most typical optical bistable device is a Fabry–Perot cavity containing a nonlinear optical medium, the refractive index of which depends on the light intensity. Upon the action of an intense input optical beam, the transmitted (or reflected) intensity of this device may exhibit a nonlinear response to the incident light intensity variation and, especially under appropriate working conditions, the characteristic output/input curve may manifest a single (or multiple) hysteresis loop(s). Such type of optical bistable device can be used as an optical differential amplifier, optical switch, optical limiter, optical clipper, optical discriminator, or an optical memory element, depending on the chosen nonlinear medium and operation conditions.
We report the realisation of optically bistable switching and memory elements, and the transphasor Can all-optical transistor) in simple one element nonlinear Fabry-Perot interferometers made from the semiconductor InSb. These devices, which operate at 5 K and 77 K with mW powers from a cw CO laser between 5 and 6 μm rely on a strongly intensity-dependent refractive index discovered near the bandgap region of InSb and explained by bandgap resonant saturation. Switching speeds are shown to be < 500 ns in these first devices and operation to much shorter timescales is predicted. Operation at room temperature and in other semiconductors at other wavelengths remains a possibility and such devices offer considerable potential for all-optical switching in integrated optics and laser pulse control.