Anisotropy of Nonlinear Coupling of Two Counter-Propagating Waves in Photorefractive Fe:KNbO3 (Postprint)

The dependence of self-pumped photorefractive two-beam coupling in Fe:KNbO3 with crystal angle has been measured at 532 nm for the a-c and b-c crystal planes using a combination of oil immersion and relay imaging. A significant deviation between existing theory and experiment is found for large crys...

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Bibliographic Details
Main Authors: Cook, G, Carns, J L, Saleh, M A, Evans, D R
Format: Report
Language:English
Subjects:
ANISOTROPY
BEAM COUPLING
CRYSTAL ANGLE
CRYSTAL STRUCTURE
Crystallography
ELECTRO-OPTIC COEFFICIENT
FRESNEL REFLECTION
IRON DOPED LITHIUM NIOBATE
NIOBATES
NONRECIPROCAL LIGHT TRANSMISSION
Optics
PE62102F
PHOTOREFRACTIVE MATERIALS
WUAFRLM08R1000
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Summary:The dependence of self-pumped photorefractive two-beam coupling in Fe:KNbO3 with crystal angle has been measured at 532 nm for the a-c and b-c crystal planes using a combination of oil immersion and relay imaging. A significant deviation between existing theory and experiment is found for large crystal angles. We propose this is due to a highly anisotropic effective charge trap density in Fe:KNbO3 of almost two orders of magnitude variation with crystal angle in the a-c plane. Prepared in collaboration with UES, Inc., Dayton, OH; Anteon Corporation, Dayton, OH; and Hardened Materials Branch, Survivability and Sensor Materials Division, Air Force Research Laboratory, Wright-Patterson AFB, OH. Published in Physical Review B, v73, paper 174102, 2006.