Grating oscillations and nonlinear effects in photorefractive crystals

Autor(en): Petrov, MP
Petrov, VM
Bryksin, VV
Gerwens, A
Wevering, S
Kratzig, E
Stichwörter: BI12SIO20 CRYSTALS; Optics; STEADY-STATE
Erscheinungsdatum: 1998
Herausgeber: OPTICAL SOC AMER
Journal: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volumen: 15
Ausgabe: 7
Startseite: 1880
Seitenende: 1888
Zusammenfassung: 
The theory of grating oscillations in photorefractive materials is developed in the linear and nonlinear approximations for the drift mechanism of holographic recording. The resonance dependence of dim-action efficiency on the phase-modulation frequency is predicted for the linear regime in which holograms are recorded by two beams, one of which is phase modulated. For long drift lengths (KgL0 much greater than 1) the resonance frequency is shown to be Omega(r) approximate to (tau(1)K(g)L(0))(-1). A more pronounced resonance peak is expected for the non-Bragg diffraction orders. In the nonlinear regime of recording, additional resonance maxims at Omega(r)/p (p is an integer) are found. Grating oscillations are experimentally studied in thin holograms of Bi12TiO20. A sharp resonance for the non-Bragg order in the interval 100-2000 Hz is detected. The position of the resonance is shown to depend on the experimental conditions. The experiment is in excellent agreement with the theory. At a high contrast ratio and in a high external electric field, distortions in the resonance dependence at Omega < Omega(r) and even a chaotic frequency dependence are found, which points to the nonlinear character of grating oscillations. (C) 1998 Optical Society of America.
ISSN: 07403224
DOI: 10.1364/JOSAB.15.001880

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