Optimum orientation of volume phase gratings in sillenite crystals: is it always [111]?

Autor(en): Shamonina, E
Kamenov, VP
Ringhofer, KH
Cedilnik, G
Kiessling, A
Kowarschik, R
Stichwörter: DIFFRACTION; LIGHT; Optics; PHOTOREFRACTIVE CRYSTALS; PIEZOCRYSTALS
Erscheinungsdatum: 1998
Herausgeber: OPTICAL SOC AMER
Journal: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volumen: 15
Ausgabe: 10
Startseite: 2552
Seitenende: 2559
Zusammenfassung: 
We study the simultaneous influence of optical activity, piezoelectric effect, and elasto-optic effect on two-wave mixing (TWM) under diffusion recording in photorefractive Bi12TiO20 and Bi12SiO20 crystals and find numerically the maximum of the TWM gain as a function of the orientation of the grating vector. Contrary to widespread belief, the grating orientation KI[111] is the optimum orientation only if optical activity is negligibly small. Nonzero optical activity results in a strong dependence of the optimum grating orientation on the crystal thickness. The strongest deviation of the optimum from the [111] direction is achieved for rho d = 180 degrees, where rho is the rotatory power and d is the crystal thickness. Our theory explains spell prior results for crystals of moderate thickness and predicts new effects for thick (e.g., fiberlike) crystals. (C) 1998 Optical Society of America [S0740-3224(98)01210-7].
ISSN: 07403224
DOI: 10.1364/JOSAB.15.002552

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