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Proceedings Paper

Lasing effect in blue phase liquid crystal
Author(s): Tsung-Hsien Lin; Chun-Wei Chen; Hung-Chang Jau; Chun-Hong Lee; Chun-Ta Wang; Chih-Wei Wu; Huai-Ping Huang; I. C. Khoo
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Paper Abstract

We report on the investigation of random lasing in blue phase liquid crystals. Multiple scattering and interference effects arising from disordered platelet texture as well as index mismatch between polymer and mesogen contribute the optical feedbacks towards laser action. In pure blue phase liquid crystals, the random laser can be switched between the coherent and incoherent types by executing distinct heating/cooling cycles; and, the randomness of lasing wavelengths can be determined by the platelet size, which can be set by controlling the cooling rate. After the blue phase liquid crystals are polymer-stabilized, coherent random lasing may occur in both the blue phase with an extended temperature interval and the isotropic liquid state; also, the selected modes are constant from one pulse to another. Additionally, if the laser dye is sensitive to temperature, the excitation threshold and the emission spectrum could be altered via thermal control.

Paper Details

Date Published: 12 September 2013
PDF: 11 pages
Proc. SPIE 8828, Liquid Crystals XVII, 882808 (12 September 2013); doi: 10.1117/12.2022738
Show Author Affiliations
Tsung-Hsien Lin, National Sun Yat-Sen Univ. (Taiwan)
Chun-Wei Chen, National Sun Yat-Sen Univ. (Taiwan)
Hung-Chang Jau, National Sun Yat-Sen Univ. (Taiwan)
Chun-Hong Lee, National Sun Yat-Sen Univ. (Taiwan)
Chun-Ta Wang, National Sun Yat-Sen Univ. (Taiwan)
Chih-Wei Wu, National Sun Yat-Sen Univ. (Taiwan)
Huai-Ping Huang, National Sun Yat-Sen Univ. (Taiwan)
I. C. Khoo, The Pennsylvania State Univ. (United States)

Published in SPIE Proceedings Vol. 8828:
Liquid Crystals XVII
Iam Choon Khoo, Editor(s)

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