Volume pinhole for mode-filtering of the femtosecond laser for use in the generation of high-order vibrational and rotational emissions by four-wave Raman mixing

Yasuyuki Hirakawa, Keiichi Ogata, Nobuyuki Takeyasu, Totaro Imasaka

Research output: Contribution to journalArticle

Abstract

The beam quality of a femtosecond dye/KrF excimer laser was improved using a pinhole, prepared from an acrylic plate. The pinhole acts as a volume light absorber that discriminates high-order transverse modes of the laser beam. A breakdown at the surface of the pinhole, which degrades the quality of the transmitted beam, can be avoided using this spatial filter. This approach was useful in minimizing self-phase modulation, which exhausts the limited laser energy and reduces the Raman output. A conversion efficiency of some vibrational and rotational emissions was improved, even though the laser pulse energy was substantially reduced by mode filtering.

Original languageEnglish
Pages (from-to)5115-5117
Number of pages3
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume39
Issue number9 A
DOIs
Publication statusPublished - Sep 2000
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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