Abstract

A Raman shifter is optimized for generating high-energy laser pulses at a 1.54μm wavelength. A forward-scattering design is described, including details of the multiple pass and nonfocused optical design, Stokes injection seeding, and internal gas recirculation. First-Stokes conversion efficiencies up to 43%—equivalent to 62% photon conversion efficiency—were measured. Experimental results show output average power in excess of 17.5 W, pulse energies of 350  mJ at 50  Hz, with good beam quality (M2<6). Narrow bandwidth and tunable output is produced when pumping with a single longitudinal mode Nd:YAG laser and seeding the process with a Stokes wavelength narrowband laser diode.

© 2007 Optical Society of America

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