INTERACTIONS OF COHERENT OPTICAL RADIATION WITH SOLIDS.
Semiannual technical summary rept., 1 May 6331 Dec 63,
RCA LABS PRINCETON NJ
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The study of double-photon absorption, harmonic generation in semiconductors, and the frequency tuning of injection lasers by uniaxial stress are reported. Observations have been made of the two-photon excitation of an electron from the valence to the conduction band in CdS. The radiative recombination emission from exciton and impurity levels subsequent to the simultaneous absorption of two quanta was observed as a function of laser intensity and compared to the emission excited by single-quanta absorption for photons. The frequency of a GaAs laser can be readily tuned by the application of uniaxial stress. Analysis of the frequency changes with stress of diodes prepared in different fashions indicates that different emission processes may be taking place. Author