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Beam combination in forward Raman conversion

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Abstract

The application of forward Raman conversion to combining the output of several laser modules into a single coherent beam with nearly diffraction-limited beam quality is receiving considerable attention. Analyses have shown that extraction efficiency and beam quality are influenced by a number of factors including pump-pump correlation, pump-seed correlation, multimode effects, multiline effects, pumping geometry, and generation of higher-order Stokes components by Raman and four-wave mixing processes. Multiline conversion is particularly relevant to XeF applications in which both efficiency (parallel-beam combination) and beam quality (crossed-beam combination) are affected. Multimode operation was found to be dependent on correlation, pumping geometry, and pump laser bandwidth. Furthermore, in multimode operation, more complicateci four-wave mixing processes (which generate parasitics) must also be taken into account.

© 1985 Optical Society of America

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