DocumentCode :
1830818
Title :
Effect of self-diffraction on erasure dynamics during readout at different wavelengths and geometries in photorefractive materials
Author :
Jeganathan, M. ; Bashaw, M.C. ; Aharoni, A. ; Hesselink, L.
Author_Institution :
Dept. of Electr. Eng., Stanford Univ., CA, USA
fYear :
1994
fDate :
25-29 Jul 1994
Firstpage :
183
Lastpage :
184
Abstract :
Certain memory applications based on photorefractive media require the ability to conveniently fix holograms. An attractive alternative is to sufficiently prolong the readout time. Low photoexcitation at long wavelength augmented by self-diffraction can increase readout time by a few orders of magnitude. The interaction of the writing and readout waves, both of the same wavelength, with the photorefractive space charge field has been investigated theoretically and experimentally. Dynamics of beam coupling and self diffraction, in certain geometries, can lead to an initial increase followed by non-exponential decay of the diffracted signal during readout. Here we study how the difference in gain, lifetime, photoexcitation and absorption at different wavelengths - which require changing incident angles to satisfy the Bragg condition - affect the decay dynamics of photorefractive gratings
Keywords :
holographic gratings; light diffraction; nonlinear optics; photorefractive effect; 514.5 nm; 632.8 nm; Bragg condition; absorption; beam coupling; erasure dynamics during readout; fix holograms; gain; geometries; lifetime; low photoexcitation at long wavelength; memory applications; photoexcitation; photorefractive gratings; photorefractive materials; photorefractive space charge field; self-diffraction; wavelengths; Absorption; Bragg gratings; Diffraction gratings; Geometry; Optical coupling; Optical propagation; Photorefractive effect; Photorefractive materials; Space charge; Writing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nonlinear Optics: Materials, Fundamentals, and Applications, 1994. NLO '94 IEEE
Conference_Location :
Waikoloa, HI
Print_ISBN :
0-7803-1473-5
Type :
conf
DOI :
10.1109/NLO.1994.470841
Filename :
470841
Link To Document :
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