Amplified spontaneous emission in high power KrF lasers

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Abstract
A three‐dimensional computer code of amplified spontaneous emission for a high power krypton fluoride (KrF) laser amplifier having a cylindrical symmetry and small aspect ratio is developed. The analysis using the present code indicates that the transverse and the longitudinal gain‐length product should be smaller than 3 and 10, respectively, if high extraction efficiency is required. Together with a recent experimental result obtained in our 500‐J laser, the present code guarantees high efficiency extraction of 500 kJ in a single beam having a 2×3 m2 cross section and a pulse duration of 1 μs.