Abstract

The photorefractive properties of Sn2P2S6 crystals in the wavelength range from 633to1064nm are investigated. Conventional yellow and modified brown crystals with a variation of nonstoichiometric defects are examined. Brown crystals respond much faster and exhibit substantially higher photorefractive gain than yellow crystals, up to 18cm1 at 780nm and 8.5cm1 at 1064nm. Ring-cavity self-pumped phase conjugation is demonstrated using both types of crystal. The phase-conjugate response of brown Sn2P2S6 is 2 orders of magnitude faster than in yellow Sn2P2S6 or Rh-doped BaTiO3, with a grating recording time below 50ms for 30mW power at 860nm. Various thresholding effects are analyzed to determine the optimal wavelength range for the two types of crystal. We find an optimum in the range of 650950nm for yellow and in the range of 8501100nm for brown Sn2P2S6.

© 2005 Optical Society of America

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