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- Title
Relaxation of the optical density of glass modulated with bichromatic radiation.
- Authors
Balakirev, M. K.; Vostrikova, L. I.; Smirnov, V. A.; Éntin, M. V.
- Abstract
Exposure of oxide glass to two coherent light beams with different frequencies ω and 2ω leads to the buildup of spatial index gratings in the glass. The kinetics of the writing and relaxation of the gratings is investigated. Illumination with one beam or a background illumination of the sample accelerates the relaxation process; this acceleration is due to the appreciable photoconductivity of the glass. The diffraction is found to reach a residual self-maintaining level when a grating is illuminated continuously with a beam at the fundamental frequency. The results are analyzed on the basis of a model that includes the coherent photogalvanic current, the accumulation of a grating of nonuniform charges under the action of this current, and the back-effect of the static field, via electrooptic effects, on the propagation of the beams. It is shown that an optical instability of the photoinduced index gratings exists in the glass. © 1996 American Institute of Physics.
- Subjects
GLASS; OPACITY (Optics)
- Publication
JETP Letters, 1996, Vol 63, Issue 3, p176
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.567000