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Picosecond gain and saturation measurements in a KrF laser amplifier depumped by amplified spontaneous emission

1991; American Institute of Physics; Volume: 70; Issue: 10 Linguagem: Inglês

10.1063/1.350233

1520-8850

Erol C. Harvey, C. J. Hooker, M. H. Key, A. Kidd, J. M. D. Lister, M. J. Shaw, W. T. Leland,

Solid State Laser Technologies

The input/output characteristic of a large aperture (270-mm diam) electron-beam-pumped KrF laser amplifier is obtained for pulses of 6- and 40-ps duration. The off-resonance absorption coefficient is estimated by measurement of loss at 268 nm. The gain-to-loss ratio is found to decrease from 8 to 6 as the specific pump rate is increased from 0.3 to 0.65 MW cm−3. Gain depumping due to amplified spontaneous emission (ASE) is treated by a simple 1D code and found to give good agreement with experiment. A 3D code incorporating wall reflections gives even better agreement. The spatial distribution of gain and ASE is recorded using visible and ultraviolet imaging.