Two-beam coupling in photorefractive Bi12SiO20 crystals with moving grating: Theory and experiments
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- Ph. Refregier
- Thomson-CSF, Laboratoire Central de Recherches, Domaine de Corbeville, B.P. No. 10, 91401 Orsay, France
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- L. Solymar
- Thomson-CSF, Laboratoire Central de Recherches, Domaine de Corbeville, B.P. No. 10, 91401 Orsay, France
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- H. Rajbenbach
- Thomson-CSF, Laboratoire Central de Recherches, Domaine de Corbeville, B.P. No. 10, 91401 Orsay, France
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- J. P. Huignard
- Thomson-CSF, Laboratoire Central de Recherches, Domaine de Corbeville, B.P. No. 10, 91401 Orsay, France
Description
<jats:p>Large values of the exponential gain coefficient Γ are obtained (Γ≂8–12 cm−1) when recording with a moving grating in photorefractive BSO crystals (nearly degenerate two-wave mixing; drift recording mode). The resolution of the Kukhtarev’s equations with a moving grating shows a resonance effect which at the optimum velocity makes the modulation of the photoinduced space charge field Esc higher. An optimum of the grating spacing also exists: Λopt:2π(E0/NA)(με/eγR)1/2. In such conditions, the space charge field is phase shifted by π/2 with respect to the incident fringe pattern; this allows an efficient beam coupling between the two recording beams. The dependence of the gain Γ versus the incident beam ratio β of the two interfering waves is interpreted by including the second-order term in the Fourier development of Esc. The conditions allowing one to obtain a reasonable agreement between the theory and experiments are presented and discussed, as well as the adopted values of the crystals’ parameters.</jats:p>
Journal
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- Journal of Applied Physics
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Journal of Applied Physics 58 (1), 45-57, 1985-07-01
AIP Publishing
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Keywords
Details 詳細情報について
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- CRID
- 1362544419222761216
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- DOI
- 10.1063/1.335646
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- ISSN
- 10897550
- 00218979
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- Data Source
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- Crossref