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A novel technique for suppression of parasitic superfluorescence in backward Raman amplifiers

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1 Author(s)
Caird, J.A. ; Bechtel National, Inc, San Francisco, CA, USA

The major parasitic modes of backward Raman amplifiers are different forms of superfluorescent forward Raman scattering. It is shown that spatial, and/or temporal variation of the Raman frequency in the scattering medium can inhibit amplification of spontaneously scattered light by creating off-resonant conditions in the forward direction. If the frequencies of the optical pulses are properly varied in time (the pulses are chirped), the required resonance condition for amplification of a counterpropagating Stokes wave can be maintained throughout the medium. Raman transition frequencies can be varied in an atomic vapor by application of a magnetic field via the Zeeman effect. The use of thallium (T1) metal vapors for scattering XeCl or KrF excimer laser radiation is considered as a particular example.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:16 ,  Issue: 4 )