Abstract
Efficient Raman conversion in H 2 gas from 0.53 μm to third Stokes (S 3 at 1.58 μm has been demonstrated using an oscillator/ amplifier configuration. Seed radiation from the oscillator controls the divergence of the Stokes beams and a capillary amplifier configuration enhances the conversion. An overall 9% photon conversion efficiency to S 3 is achieved with the S 3 beam divergence twice the diffraction limit. Photon conversion efficiency within the amplifier is ≈ 20%.
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