Ferroelectric photorefractive Sn2P2S6 crystals become more sensitive to cw radiation of a Nd3+: YAG laser (λ = 1.06 µm) by preexposure with incoherent white light. Space-charge formation and hologram recording are dominated by a diffusionlike charge transport, leading to an ultimate gain factor for transmission gratings that exceeds 6 cm-1 at a laser intensity of approximately 50 W/cm2.
© 1996 Optical Society of America
Serguey G. Odoulov, Alexander N. Shumelyuk, Ute Hellwig, Romano A. Rupp, Alexander A. Grabar, and Ivan M. Stoyka, "Photorefraction in tin hypothiodiphosphate in the near infrared," J. Opt. Soc. Am. B 13, 2352-2360 (1996)