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D. A. B. Miller and S. D. Smith, "Two
Beam Optical Signal Amplification and Bistability in InSb," Optics Commun. 31,
101-104 (1979). Reports on the application of bandgap resonant nonlinear
refraction to optical amplifier and switch devices-based on a nonlinear Fabry-Perot
interferometer constructed from an InSb crystal. One such device, called a 'transphasor',
amplifies small power changes in one laser beam to give larger changes in a second. The
effects are interpreted by a microscopic mechanism which includes the effects of power
broadening as a contribution to chi /sup (3)/ to explain its large value of approximately
10/sup -2/ esu
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