Abstract.
The heavily depleted steady-state gain in a large-aperture amplifier can be transiently enhanced by temporally suppressing the intra-cavity amplified spontaneous emission (ASE). In our previous experiments of amplifying two 10-ps pulses in a 29-cm-diameter KrF amplifier, we showed that output fluences of three times the saturation energy density Esat were obtained at a pulse separation of 1.7 ns for full-filling beams, whereas it took 4 ns for 5-cm-diameter beams. Our recently developed time-dependent ASE code almost reproduced this observed quick gain recovery. In this paper, we report the experimental results of amplifying six 10-ps pulses in series to the saturation level in the large-aperture amplifier. The quick gain recovery was observed also for the pulse train. Short-pulse outputs of 3Esat were obtained at a reduced pulse separation of only 1.5 ns.
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Received: 12 March 1999 / Published online: 19 May 1999
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Okuda, I., Tomie, T. & Owadano, Y. Transient gain enhancement for a train of picosecond pulses in a large-aperture KrF laser amplifier . Appl Phys B 69, 85–86 (1999). https://doi.org/10.1007/s003400050774
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DOI: https://doi.org/10.1007/s003400050774