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Lowering the Lasing Threshold by Introducing Cholesteric Liquid Crystal Films to Dye-Doped Cholesteric Liquid Crystal Cell Surfaces

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Published 9 November 2005 • Copyright (c) 2005 The Japan Society of Applied Physics
, , Citation Kazuhiro Amemiya et al 2005 Jpn. J. Appl. Phys. 44 7966 DOI 10.1143/JJAP.44.7966

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1 Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan

2 Central Technical Research Laboratory, Nippon Oil Corporation, 8 Chidori-cho, Naka-ku, Yokohama 231-0815, Japan

Dates

  1. Received 27 June 2005
  2. Accepted 10 August 2005
  3. Published

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Abstract

The effect of the introduction of polymer cholesteric liquid crystal (PCLC) films on the threshold of dye-doped cholesteric liquid crystal (CLC) distributed feedback (DFB) cavity lasing has been investigated. A PCLC film used to reflect a pump beam brings about the efficient use of incident energy, whereas a PCLC film used to reflect the emission contributes to amplifying the stimulated emission. As a result, the cell, in which both PCLC films are introduced, gains about a 60% reduction in the lasing threshold. It is also found that a lasing threshold exists not only for the excitation energy but also for the emission intensity. Namely, the lasing starts to occur at a certain emission level irrespective of the cell structures.

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10.1143/JJAP.44.7966