Title :
Temporal fluctuation in photorefractive wave mixing
Author :
Xie, Ping ; Mishima, Teruhito
Author_Institution :
Div. of Electron. & Inf. Eng., Hokkaido Univ., Sapporo, Japan
fDate :
11/1/2001 12:00:00 AM
Abstract :
We analyzed the physical origin of the temporal fluctuation of the photorefractive space-charge field, and found that fluctuation mainly results from fluctuations in the free-charge-carrier density which is, in turn, due to the very small fluctuations of the input total intensity and the thermal excitation. We studied the influence of various externally-controlled parameters such as the grating wave vector, the applied electric field, and the moving velocity of the grating on the fluctuation of the photorefractive space-charge field. We present experimental results for temporal fluctuations in photorefractive BaTiO 3:Ce two-wave mixing and in BaTiO3 self-pumped phase conjugation. The experimental results show agreement with the theoretical result
Keywords :
barium compounds; cerium; fluctuations; multiwave mixing; optical phase conjugation; optical pumping; photorefractive materials; BaTiO3; BaTiO3:Ce; applied electric field; externally-controlled parameters; free-charge-carrier density; grating wave vector; input total intensity; moving velocity; photorefractive BaTiO3:Ce; photorefractive space-charge field; photorefractive wave mixing; physical origin; self-pumped phase conjugation; temporal fluctuation; temporal fluctuations; thermal excitation; very small fluctuations; Fluctuations; Gratings; Helium; Impurities; Nonlinear optics; Optical materials; Optical mixing; Photorefractive effect; Photorefractive materials; Physics;
Journal_Title :
Quantum Electronics, IEEE Journal of
