Numerical study of phase conjugation in stimulated Brillouin scattering from an optical waveguide

Technical Report · Thu Dec 30 04:00:00 EST 1982

OSTI ID:6570988

Lehmberg, R H

Phase conjugation in stimulated Brillouin scattering (SBS) from an optical waveguide is studied numerically, using a Cartesian two dimensional propagation code (BOUNCE) that includes pump depletion. The simulations show that light scattered back through a phase aberrator produces a far field profile closely matching that of the incident beam; however, the near field intensity exhibits large and rapid spatial inhomogeneties across the entire aberrator, even for conjugation fidelities H as high as 98%. This effect can be only partially removed by spatial filtering techniques. The dependence of H upon SBS gain, scattering length L, and the average intensity I and angular divergence theta/sub D/ of the pump beam is first studied in the low reflectivity regime (i.e., ignoring pump depletion). For amplitude gains greater than or equal to e/sup 10/, H decreases monotonically with the factor I/theta/sub D/ due to a small scale intensity pulling effect. This result appears to be independent of whether theta/sub D/ arises entirely from the aberrator, or from a combination of the aberrator plus curvature introduced by a lens. In all cases, pump depletion is found to enhance the fidelity by inhibiting the small scale pulling effect. Under appropriate conditions, this can actually reverse the intensity dependence of H seen in the absence of pump depletion.

• Research Organization: Naval Research Lab., Washington, DC (USA)
• DOE Contract Number: AI01-76ET53020
• OSTI ID: 6570988
• Report Number(s): NRL-MR-4985; ON: DE83005104
• Country of Publication: United States
• Language: English

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AMPLIFICATION
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