Abstract

The photorefractive properties of ${\mathrm{Sn}}_2{\mathrm{P}}_2{\mathrm{S}}_6$ crystals doped with Te and Sb in the near-infrared wavelength range up to $1064\mathrm{nm}$ are reported. The main photorefractive parameters, i.e., two-wave mixing gain, effective electro-optic coefficient, diffusion length, concentration of traps, and response time, are compared with conventional nominally pure ${\mathrm{Sn}}_2{\mathrm{P}}_2{\mathrm{S}}_6$. Te-doped ${\mathrm{Sn}}_2{\mathrm{P}}_2{\mathrm{S}}_6$ shows the fastest response with the smallest decrease of the photorefractive efficiency with increasing wavelength in the near infrared. Sb doping, on the other hand, inhibits photorefraction in the near infrared. ${\mathrm{Sn}}_2{\mathrm{P}}_2{\mathrm{S}}_6:\mathrm{Te}$ and ${\mathrm{Sn}}_2{\mathrm{P}}_2{\mathrm{S}}_6:\mathrm{Sb}$ crystals both show a high two-wave mixing gain Γ at $633\mathrm{nm}$, and 10 and $20{\mathrm{cm}}^{-1}$. Te-doped ${\mathrm{Sn}}_2{\mathrm{P}}_2{\mathrm{S}}_6$ shows a photorefractive gain of $4.5{\mathrm{cm}}^{-1}$ at $1064\mathrm{nm}$. Response times at $1064\mathrm{nm}$ of $20\mathrm{ms}$ have been measured for the intensity $6\mathrm{W}∕{\mathrm{cm}}^2$, which is 2 orders of magnitude shorter than in Rh-doped $\mathrm{Ba}\mathrm{Ti}{\mathrm{O}}_3$.

© 2007 Optical Society of America

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