Crystal orientation dependence of the SNR for signal beam amplification in photorefractive BaTiO3

Abstract In signal beam amplification by two-beam coupling in BaTiO 3 photorefractive crystals, beam fanning in the direction of the amplified signal reduces the signal-to-noise ratio (SNR). The dependence of the SNR and the signal beam gain on the crystal orientation are analysed using a HeNe laser. It is found that orientating the crystal for maximum gain gives poor signal-to-noise ratio. A compromise has to be made between the SNR and high gain for optimum signal amplification.

[1]  D. Staebler,et al.  Holographic storage in electrooptic crystals , 1973 .

[2]  I. Ledoux,et al.  Two-wave mixing and energy transfer in BaTiO3 application to laser beamsteering , 1984 .

[3]  G. M. Morris,et al.  Bandpass filtering in barium titanate. , 1988, Applied optics.

[4]  Ratnakar R. Neurgaonkar,et al.  Photorefractive properties of strontium‐barium niobate , 1987 .

[5]  Theo T. Tschudi,et al.  Coherent CW image amplifier and oscillator using two-wave interaction in a BaTiO3-crystal , 1983 .

[6]  W R Christian,et al.  Two-wave mixing and phase conjugation at 830 nm in BaTiO(3). , 1989, Optics letters.

[7]  J. G. Duthie,et al.  Semilinear double phase conjugate mirror , 1990 .

[8]  J P Huignard,et al.  Noise suppression in photorefractive image amplifiers. , 1989, Optics letters.

[9]  P Yeh,et al.  Spatial amplification: an image-processing technique using the selective amplification of spatial frequencies. , 1990, Optics letters.

[10]  Two-beam cross coupling from mutually incoherent lasers , 1989 .

[11]  M. Soskin,et al.  Holographic storage in electrooptic crystals. i. steady state , 1978 .

[12]  George C. Valley,et al.  Competition between forward- and backward-stimulated photorefractive scattering in BaTiO 3 , 1987 .

[13]  Theo T. Tschudi,et al.  Image amplification by two- and four-wave mixing in BaTiO 3 photorefractive crystals , 1986 .

[14]  Jack Feinberg,et al.  Asymmetric self-defocusing of an optical beam from the photorefractive effect , 1982 .

[15]  S H Lee,et al.  Optical digital logic operations by two-beam coupling in photorefractive material. , 1986, Applied optics.

[16]  Y. Fainman,et al.  Optimal coherent image amplification by two-wave coupling in photorefractive BaTiO3 , 1986 .