Abstract
Losses have been measured at 257.2 nm in e-beam-pumped, KrF laser mixtures at pump rates up to 4 MW/cm3 and pressures up to 3000 Torr. A maximum absorption of 3.5% cm−1 is observed in a gas mixture of 4-Torr F2, 125-Torr Kr, and 2871-Torr Ar. Losses are reduced in the presence of lasing. The absorption cross section of Kr2F* at 257.2 nm is estimated to be 1.8(±1.1)×10−17 cm2. Net gain has been measured as a function of pump rate in a gas mixture of 4-Torr F2, 125-Torr Kr, and 1371-Torr Ar. A net gain of 22% cm−1 and a gain to nonsaturable loss ratio ∼20 have been observed.
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