Investigation of two-wave mixing in arbitrary oriented sillenite crystals

Shamonina, E. and Cedilnik, G. and Mann, M. and Kiessling, A. and Webb, David J. and Kowarschik, R. and Ringhofer, K.H. (1997) Investigation of two-wave mixing in arbitrary oriented sillenite crystals. Applied Physics B-Lasers and Optics, 64 (1). pp. 49-56. ISSN 0946-2171. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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A generalized systematic description of the Two-Wave Mixing (TWM) process in sillenite crystals allowing for arbitrary orientation of the grating vector is presented. An analytical expression for the TWM gain is obtained for the special case of plane waves in a thin crystal(\g\d much less than 1) with large optical activity(\g\rho much less than 1, g is the coupling constant, rho the rotatory power, d the crystal thickness). Using a two-dimensional formulation the scope of the nonlinear equations describing TWM can be extended to finite beams in arbitrary geometries and to any crystal parameters. Two promising applications of this formulation are proposed. The polarization dependence of the TWM gain is used for the flattening of Gaussian beam profiles without expanding them. The dependence of the TWM gain on the interaction length is used for the determination of the crystal orientation. Experiments carried out on Bi12GeO20O crystals of a non-standard cut are in good agreement with the results of modelling.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Optics
Depositing User: T.J. Sango
Date Deposited: 13 May 2009 10:05
Last Modified: 25 Jun 2014 11:42
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