Abstract
Stimulated Brillouin scattering (SBS) has been shown to be a useful phase conjugation technique. 1 In many situations, it would be desirable to reduce the required threshold power to both allow conjugation of lower power beams and also reduce the rote of competing processes such as optical breakdown. The most straightforward approach to lower the threshold achieved with a single focus is simply to refocus the transmitted beam to create another SBS interaction region. It can readily be seen that in the absence of optical transmission losses this should approximately halve the SBS threshold. For a given geometry the steady state threshold power is simply the power level which produces sufficient total SBS gain (typically e25 to e30) to amplify spontaneous emission to levels comparable to the incident beam. As shown in Fig. 1, the introduction of a second focus doubles the effective interaction length and thus reduces the threshold power commensurately.
© 1989 Optical Society of America
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