Hologram restoration and enhancement in photorefractive media
- Resource Type
- Conference
- Authors
- Pochi Yeh; Gu, C.; Cheng, C.-J.; Hsu, K.Y.
- Source
- Proceedings of 1994 Nonlinear Optics: Materials, Fundamentals and Applications Nonlinear optics Nonlinear Optics: Materials, Fundamentals, and Applications, 1994. NLO '94 IEEE. :421-423 1994
- Subject
- Photonics and Electrooptics
Engineered Materials, Dielectrics and Plasmas
Components, Circuits, Devices and Systems
Photorefractive materials
Laser beams
Optical interferometry
Optical recording
Optical computing
Photorefractive effect
Optical diffraction
Diffraction gratings
Optical pulses
Image restoration
- Language
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.ETX