Title :
Hologram restoration and enhancement in photorefractive media
Author :
Yeh, Pochi ; Gu, Claire ; Cheng, Chau-Jern ; Hsu, Ken Y.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
Abstract :
We have proposed and analyzed a new and simple optical method for the enhancement and restoration of decaying holograms in photorefractive media. The results indicate that extremely weak holograms can be enhanced provided that the two-beam coupling is sufficiently strong. Steady-state photorefractive holograms can be maintained continuously without decay by using a double-side alternating readout schedule in conjunction with a phase conjugator. The result also provides an explanation for the formation of mutually pumped phase conjugation in terms of the successive enhancement of an initial noise grating
Keywords :
holographic gratings; optical couplers; optical phase conjugation; photorefractive effect; decaying holograms; double-side alternating readout schedule; extremely weak holograms; hologram enhancement; hologram restoration; initial noise grating; mutually pumped phase conjugation; phase conjugator; photorefractive media; steady-state photorefractive holograms; two-beam coupling; Diffraction gratings; Image restoration; Laser beams; Optical computing; Optical diffraction; Optical interferometry; Optical pulses; Optical recording; Photorefractive effect; Photorefractive materials;
Conference_Titel :
Nonlinear Optics: Materials, Fundamentals, and Applications, 1994. NLO '94 IEEE
Conference_Location :
Waikoloa, HI
Print_ISBN :
0-7803-1473-5
DOI :
10.1109/NLO.1994.470760
