Characteristics of an electron beam pumped KrF laser amplifier with an atmospherichyphen;pressure Krhyphen;rich mixture in a strongly saturated region

摘要

Amplifier characteristics of a KrF laser were investigated as a function of Kr concentration for a wide range of input intensity. The experiments were performed with atmospherichyphen;pressure mixtures excited by a 65hyphen;ns (full width at halfhyphen;maximum), 160hyphen;A/cm2electron beam. The extracted intensity (output intensity minus input intensity) from a singlehyphen;pass (50 cm) amplifier was maximized at an input intensity around 5 MW/cm2and then, the power efficiencies were 12.6, 13.7, 13.3, and 11.3percnt; for Kr concentrations of 10, 20, 40, and 99.4percnt;, respectively. The smallhyphen;signal gain, absorption coefficient, and saturation intensity were determined for each mixture by using an analysis due to Rigrod lsqb;J. Appl. Phys.36, 2487 (1965)rsqb;. The KrFast; formation efficiency and the extraction efficiency were also obtained as a function of Kr concentration.