We develop a theory of the photorefractive nonlinear response for ${\mathrm{Sn}}_2{\mathrm{P}}_2{\mathrm{S}}_6$ crystals. The theory incorporates two types of charge carrier (optically active and passive), provides explicit expressions for the characteristic buildup–relaxation rates and gain factors, explains naturally a big variety of accumulated experimental data, and facilitates characterization–optimization of this important nonlinear material.

© 2007 Optical Society of America

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