Thermal grating-mediated wave mixing and beam amplification in nematic liquid crystal thin films

P. Yan, I. C. Khoo

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

A model is presented of thermal grating-mediated wave mixing and amplification. The model includes a strong pump beam, a weak probe beam, and a first-order diffracted beam. The coupled Maxwell's wave equations and the thermal diffusion equation are solved using a self-consistent formalism. The influence of various input beam parameters (the pump to probe beam intensity ratio, beam intensities, crossing angle, wavelength) and sample parameters (the thermal nonlinear coefficient, thermal conductivity, sample thickness) on the wave mixing effects is considered. Some recently observed infrared beam amplification effects have been qualitatively described by the theory of the optimum configuration for signal (probe) beam amplification with nematic liquid crystals. The results are important for optical phase conjugation and self-oscillation processes involving infrared lasers, and demonstrate the particular usefulness of liquid crystals for these applications.

Original languageEnglish (US)
Pages (from-to)520-529
Number of pages10
JournalIEEE Journal of Quantum Electronics
Volume25
Issue number3
DOIs
StatePublished - Mar 1989

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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