Diffractive microlenses replicated in fused silica for excimer laser beam homogenizing

Fredrik Nikolajeff*, Sverker Hard, Bernard Curtis

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A diffractive beam homogenizer, based on an array of square, off-axis, continuous-relief diffractive microlenses, for use with an excimer laser has been studied. The homogenizer was originally fabricated by direct-write electron-beam lithography, from which replicas in UV-grade fused silica were made by hot embossing and reactive ion etching. Atomic force microscopy measurements of original and replicated elements showed the accuracy of the replication fidelity. One of the replicated homogenizers was evaluated together with a KrF excimer laser. The homogenized beam had a flat-top profile with 31% of the beam energy contained within an area where the beam intensity was above a threshold level of 90% of the maximum intensity.

    Original languageEnglish
    Pages (from-to)1-24
    Number of pages24
    JournalDoktorsavhandlingar vid Chalmers Tekniska Hogskola
    Issue number1263
    Publication statusPublished - 1997

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