Abstract
Invited PaperBroadband and Multiline Raman Beam CombinationShirley J. PfeiferTRW, Optics and Directed Energy LaboratoryOne Space Park Drive, Redondo Beach, California 90278AbstractExperimental and analytical work on the effects of temporal correlation and lineardispersion in broadband and multiwavelength Raman conversion will be presented. Aninterferometric technique for demonstrating the influence of the correlation properties ofthe Stokes seed and pump beam(s) on the spatial coherence of the amplified Stokes will bediscussed. Analytical work on the effect of linear dispersion on conversion efficiencyand beam cleanup in two -line XeF Raman beam combination is also presented.IntroductionRaman beam combination is a promising method for combining beams from several lasermodules into a single, coherent output with improved beam quality (BQ). In practicalsystems, utilizing large bandwidth lasers which may operate on more than one line, severalissues in the Raman process need to be addressed. These issues include temporalcorrelation requirements on the pump beams and seed beam in parallel and crossed beamgeometries, effect of linear dispersion and four -wave mixing mechanisms in multilineoperation, and beam cleanup as a function of Fresnel number, scale -size of the aberration,dispersion characteristics of the medium, gain saturation, and pumping geometry.
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