Improvement of the KrF(B→X) excimer lamp with 248 and 193 nm dual wavelength emission using an Ar buffer

Ichiro Nakamura, Fumihiko Kannari, Minoru Obara

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    Abstract

    A quasi-continuous KrF(248 nm:B→X)fluorescence of over 8 ms pulse duration with a 100 Hz operation frequency was observed in a microwave-discharge-pumped KrF lamp with an Ar buffer gas in place of the He/Ne buffer. With an average microwave power deposition of 517.1 W, the maximum average KrF fluorescence power was 58.2 W obtained at a KrF intrinsic efficiency of 11.2% with the lamp gas mixture of F2/Kr/Ar=4/2/94(%) at 50 Torr and simultaneously an average ArF(193 nm:B→X) fluorescence power of 17.4 W with over 8 ms pulse duration at a 100 Hz operation frequency was also obtained. Based on the total fluorescence power of ArF and KrF, the intrinsic efficiency becomes as high as 14.6%. The maximum KrF intrinsic efficiency was 13.8% obtained with a lamp gas mixture of F2/Kr/Ar=2/2/96(%) at 50 Torr. The maximum average KrF fluorescence power and KrF intrinsic efficiency with the Ar buffer has exceeded the maximum average KrF fluorescence of 53 W and the corresponding KrF intrinsic efficiency of 8.3% achieved previously with the lamp gas mixture of F2/Kr/He/Ne=2/1/48.5/48.5(%) at 50 Torr. Dual wavelength emission should be useful for those that need both the 248 and 193 nm wavelengths.

    Original languageEnglish
    Pages (from-to)2057-2059
    Number of pages3
    JournalApplied Physics Letters
    Volume57
    Issue number20
    DOIs
    Publication statusPublished - 1990 Dec 1

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

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