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Conferences > NLGW > 1996 > FD > FD.20

Second-harmonic generation from tetragonal chalcopyrite-structure semiconductor thin films

D. J. Bottomley, P. J. Fons, S. Niki, A. Yamada, A. Mito, W. Bi, and C. W. Tu

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Abstract

Tetragonal chalcopyrite-structure semiconductor crystals have acquired a niche within the realm of nonlinear optics (NLO) as second order NLO materials in the 2 μm to 20 μm wavelength infra-red region [1]. Examples include AgGaS2, AgGaSe2, ZnGeP2, CdGeAs2 and HgGa2S4. Compared with other NLO crystals, chalcopyrite-structure crystals are characterized by high nonlinearities and low damage thresholds. The latter quality makes them ill-suited to frequency-converting powerful laser beams, which is why they tend to be applied only in the infra-red region, where the few alternative crystals suffer from similar problems.

© 1996 Optical Society of America

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