Molecular hydrogen and deuterium diffused into a conventional solid silica optical fiber (gas in glass) exhibit large stimulated Raman gain.1 Deuterium- charged fibers have been synchronously pumped (ring configuration pumped by a cw mode-locked Nd:YAG laser) to obtain 20-W pulses 15 psec long with a 100-MHz repetition rate at 1.58 μm.2 This pumping configuration was required to suppress recirculating first Stokes light of silica at 1.12 μm. We describe an alternative approach whereby the gas-in-glass laser can be operated in a much simpler single-pass configuration. With the new modification the gas-in-glass laser can be pumped by either a mode-locked or Q-switched Nd:YAG laser and produces pulses with durations of ~10 psec or ~100 nsec-1 μsec, respectively, with ~10-W amplitude.

© 1985 Optical Society of America

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