INVESTIGATION OF PHOTOREFRACTIVE TWO-WAVE COUPLING IN Cr-DOPED STRONTIUM BARIUM NIOBATE CRYSTAL
Zhao Jian-lin (赵建林)a, Wang Bin (王彬)a, Wu Jian-jun (吴建军)a, Yang De-xing (杨德兴)a, S. Kapphanb, R. Pankrathb
a Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China; b Universit?t Osnabrück, Fachbereich Physik, D- 49069 Osnabrück, Germany
Abstract We present here the experimental results of photorefractive two-wave coupling in the congruent strontium barium niobate (SBN:61) crystal doped with 1000ppm Cr. Employing a He－Ne laser (632.8nm), we observed the coupling characteristics under different conditions. The crystal shows excellent photorefractive properties, with a high coupling coefficient nearly 6cm-1 as the beam intensity ratio m is less than 100. The saturated coupling coefficient of SBN:61:Cr shows a maximum at a certain external beam crossing angle 2$\theta$peak, which varies with different m, showing a nearly linear dependence on m. The saturated coupling response time $\tau$ is measured to be less than 0.8 s. The response time decreased with increasing beam crossing angles no matter how large m is. We also observed the behaviour of the probe beam in reversed experimental procedures. We found that the probe beam shows a bistable state in both procedures.
Received: 19 December 2000
Revised: 22 February 2001
Accepted manuscript online:
PACS:
42.70.Nq
(Other nonlinear optical materials; photorefractive and semiconductor materials)
(Gas lasers including excimer and metal-vapor lasers)
Fund: Project supported by the "211" Project of Northwestern Polytechnical University. Part of this work was done in the Department of Physics at the University of Osnabrück in Germany, and supported by "SFB225" of DFG.
Cite this article:
Zhao Jian-lin (赵建林), Wang Bin (王彬), Wu Jian-jun (吴建军), Yang De-xing (杨德兴), S. Kapphan, R. Pankrath INVESTIGATION OF PHOTOREFRACTIVE TWO-WAVE COUPLING IN Cr-DOPED STRONTIUM BARIUM NIOBATE CRYSTAL 2001 Chinese Physics 10 739
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