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Manuscript Title: Modelling of two wave mixing experiments in sillenite crystals.
Authors: M. Mann, E. Shamonina, K.H. Ringhofer
Program title: TWM
Catalogue identifier: ADDD_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 96(1996)61
Programming language: Fortran.
Computer: HP9000 Series 700.
Operating system: HP-UX 9.05, AIX 3.2.5.
RAM: 40M words
Word size: 32
Keywords: Dynamic holography, Non-plane waves, Method of Characteristics, Two wave mixing, Optics.
Classification: 18.

Nature of problem:
An approach to dynamic holography with non plane waves in sillenite crystals based on geometric optics ideas is presented. The temporal development of the hologram is divided in "reading" (diffraction of the light at the fixed holographic grating) steps and "writing" (buildup of the refractive index grating under fixed illumination) steps and pursued towards the stationary state via a relaxation procedure. The reading equations are solved numerically using a twodimensional RUNGE-KUTTA scheme.

Restrictions:
The program can handle cylindrical and plane finite beams in two spatial dimensions. The characteristic times for the modulation of the periodic light pulses have to be much larger than nd/c with nd being the optical thickness of the crystal.

Running time:
Depends heavily on the size of the problem (ranging from several minutes up to several days).

References:
[1] E. Shamonina, M. Mann, K.H. Ringhofer, A. Kiessling and R. Kowarschik, Dynamic Holography with non-plane Waves in Sillenites, Opt. Quantum Electron. (1996), accepted for publication