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Proceedings Paper

Random lasing in a bistable smectic A liquid crystal
Author(s): S. M. Morris; A. D. Ford; D. J. Gardiner; H. J. Coles
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Paper Abstract

In this work, we examine the phenomenon of random lasing from the smectic A liquid crystal phase. We summarise our results to date on random lasing from the smectic A phase including the ability to control the output from the sample using applied electric fields. In addition, diffuse random lasing is demonstrated from the electrohydrodynamic instabilities of a smectic A liquid crystal phase that has been doped with a low concentration of ionic impurities. Using a siloxane-based liquid crystal doped with ionic impurities and a laser dye, nonresonant random laser emission is observed from the highly scattering texture of the smectic A phase which is stable in zero-field. With the application of a low frequency alternating current electric field, turbulence is induced due to motion of the ions. This is accompanied by a decrease in the emission linewidth and an increase in the intensity of the laser emission. The benefit in this case is that a field is not required to maintain the texture as the scattering and homeotropic states are both stable in zero field. This offers a lower power consumption alternative to the electric-field induced static scattering sample.

Paper Details

Date Published: 9 May 2007
PDF: 10 pages
Proc. SPIE 6587, Liquid Crystals and Applications in Optics, 65870Q (9 May 2007); doi: 10.1117/12.723347
Show Author Affiliations
S. M. Morris, Univ. of Cambridge (United Kingdom)
A. D. Ford, Univ. of Cambridge (United Kingdom)
D. J. Gardiner, Univ. of Cambridge (United Kingdom)
H. J. Coles, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 6587:
Liquid Crystals and Applications in Optics
Milada Glogarova; Peter Palffy-Muhoray; Martin Copic, Editor(s)

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