Abstract
In a large-aperture amplifier, steady-state gain is heavily reduced by the intra-cavity amplified spontaneous emission (ASE). However, the reduced gain could be transiently enhanced by temporally suppressing the ASE with an intense depleting short pulse. This transient gain enhancement is experimentally studied in a 29-cm-diameter-aperture KrF laser amplifier. The gain depleted by a 10-ps pulse is observed to recover more quickly to the initial steady-state gain level when the aperture of the amplifier is filled with the depleting beam than when only 3% of the aperture is filled.
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