Output characteristics of a discharge-pumped F2 laser (157 nm) with an injection-seeded unstable resonator

M. Kakehata, C. H. Yang, Y. Ueno, F. Kannari

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Abstract

To improve beam quality, an injection-seeded unstable resonator was applied to a discharge-pumped F2 laser, which is normally dominated by amplified spontaneous emission with a large beam divergence when using a normal stable cavity, due to the laser's extremely high gain (a small-signal gain-length product ∼29). The time-dependent injection-seeding efficiency was obtained for various injection timings by measuring a ratio of the output laser intensity with the same polarization as the seed laser. Correlation of the injection-seeding efficiency with the temporal evolution of the laser-beam divergence was also studied. Both the time-dependent beam divergence and the injection-seeding efficiency showed degradation at a later part of the laser pulse.

Original languageEnglish
Pages (from-to)2241-2246
Number of pages6
JournalJournal of Applied Physics
Volume74
Issue number4
DOIs
Publication statusPublished - 1993 Dec 1

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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