Low-power (10.6-μm) laser-beam amplification by thermal-grating-mediated degenerate four-wave mixing in a nematic liquid-crystal film

Iam-choon Khoo, P. Y. Yan, G. M. Finn, T. H. Liu, R. R. Michael

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

We present a detailed theoretical analysis of degenerate four-wave mixing by a laser-induced thermal grating in a nematic liquid-crystal film. In particular, we show that the coupling of the (strong) pump beam to the first-order diffracted beam can give rise to substantial amplification of a (weak) probe beam. Experimental verification of this effect with a CO2 laser beam is also made. A probe-beam gain of greater than 20 can easily be observed in a 120-μm film with a pump intensity of the order of a few watts per square centimeter.

Original languageEnglish (US)
Pages (from-to)202-206
Number of pages5
JournalJournal of the Optical Society of America B: Optical Physics
Volume5
Issue number2
DOIs
StatePublished - Jan 1 1988

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

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