Abstract

We propose that thin films of tetragonal chalcopyrite-structure semiconductor media are promising nonlinear-optical (NLO) materials for the following reasons: Phase matching is possible with them in principle, they can be utilized in a waveguide geometry, and they are compatible with III–V substrates. We investigate the second-order NLO properties of chalcopyrite-structure CuInSe2 and CuGaSe2 thin films grown on GaAs(001), using optical second-harmonic (SH) generation at a fundamental wavelength of 790 nm. The SH intensities produced by approximately stoichiometric CuInSe2 and CuGaSe2 thin films are similar to that of GaAs. The second-order optical nonlinearities are strongly curtailed in nonstoichiometric thin films.

© 1996 Optical Society of America

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