Stimulated Brillouin scatter SIX-code

Marvin M. Litvak; Richard J. Wagner

doi:10.1117/12.43678

1 May 1991 Stimulated Brillouin scatter SIX-code

Marvin M. Litvak, Richard J. Wagner

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Proceedings Volume 1415, Modeling and Simulation of Laser Systems II; (1991) https://doi.org/10.1117/12.43678
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

Results are reported of a time-dependent, three-dimensional code, which models phase conjugation by stimulated Brillouin scatter (SBS). The nonlinear equations for the pump, the backscattered Stokes, and the phonon fields are transformed to remove the major effects of demagnification down to each focal region. Bradley's adaptive coordinates in this code allow efficient allocation of a three-dimensional grid for the finite Fourier transform propagation algorithms. A second-order Runge-Kutta scheme integrates the counter-propagating waves spatially and the phonon field temporally. The code models a phase conjugation assembly that consists of one or more cells of a nonlinear medium, such as 40-atmospheres xenon or liquid n-hexane, in a single focus or multifoci threshold reduction configuration. Time-delay is applied to the pump and Stokes field crossing the distance between foci. The focus-to-focus distance is close to the value corresponding to the length of the resonator that generated the longitudinal laser modes in the pump, to maintain coherence over the large distances. Multiple transverse modes, having different spatial field distributions, may also be included. With both transverse and longitudinal modes, it is shown that the conjugation fidelity can be modulated to an undesirable extent. The results include time histories of the output Stokes intensity and of the conjugation fidelity. Polarization properties of the fields are also reported for test simulations, in which an approximate quarter-wave plate lies between two such SBS cells. The implications for oscillator isolation owing to undesirable polarization rotation by optical birefringent windows (analogous to the quarter-wave plate) are discussed.

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Marvin M. Litvak and Richard J. Wagner "Stimulated Brillouin scatter SIX-code", Proc. SPIE 1415, Modeling and Simulation of Laser Systems II, (1 May 1991); https://doi.org/10.1117/12.43678

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KEYWORDS

Phonons

Polarization

Resonators

Laser systems engineering

Modeling and simulation

Modulation

3D modeling

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