9 May 2007 Random lasing in a bistable smectic A liquid crystal
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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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
S. M. Morris, S. M. Morris, A. D. Ford, A. D. Ford, D. J. Gardiner, D. J. Gardiner, H. J. Coles, H. J. Coles, } "Random lasing in a bistable smectic A liquid crystal", Proc. SPIE 6587, Liquid Crystals and Applications in Optics, 65870Q (9 May 2007); doi: 10.1117/12.723347; https://doi.org/10.1117/12.723347


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