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Proceedings Paper

Liquid crystal lasers
Author(s): J. Schmidtke
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Paper Abstract

Photonic band edge lasers based on cholesteric liquid crystals (CLCs) have attracted considerable interest as selfassembled, tunable, microscopic, coherent light sources. We discuss several ways to improve the lasing performance: lasing threshold and slope efficiency can both be improved by stabilizing the liquid crystalline order to suppress heatinduced distortions during the pumping process. This can be achieved either by photo-crosslinking reactive mesogens, or by applying an electric field along the helical axis of a CLC with negative dielectric anisotropy. Defect mode lasing with exceptionally low lasing threshold can be easily achieved with polymeric systems by insertion of a phase jump in the chiral molecular order. Finally, electrical fine tuning of the laser emission by application of an in-plane electric field electric field will be discussed.

Paper Details

Date Published: 12 September 2013
PDF: 6 pages
Proc. SPIE 8828, Liquid Crystals XVII, 882806 (12 September 2013); doi: 10.1117/12.2022345
Show Author Affiliations
J. Schmidtke, Univ. Paderborn (Germany)

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

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