12 April 2005 Nonresonant random lasing from a dye-doped smectic A* scattering device
Author Affiliations +
Abstract
Nonresonant random lasing from a dye-doped smectic A* scattering device is demonstrated. The field-induced scattering state of a low molar mass liquid crystal in the smectic A* phase is found to provide sufficient feedback to generate random lasing when a gain material, such as a fluorescent dye, is doped into the liquid crystal host. Furthermore, we found that the emission intensity of the random laser at a given excitation energy can be adjusted by altering the strength of the applied electric field so as to modify the scattering texture and consequently the transport mean free path. This change in the transport mean free path results in a change in the random lasing threshold. Large values for the transport mean free path, which indicate a weak scattering strength, result in large threshold values and vice-versa. Finally, we discuss the benefits of controlling the scattering strength with an applied electric field in terms of potential device applications.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Stephen M. Morris, Stephen M. Morris, Alison D. Ford, Alison D. Ford, Mikhail N. Pivnenko, Mikhail N. Pivnenko, Harry James Coles, Harry James Coles, } "Nonresonant random lasing from a dye-doped smectic A* scattering device", Proc. SPIE 5741, Emerging Liquid Crystal Technologies, (12 April 2005); doi: 10.1117/12.593912; https://doi.org/10.1117/12.593912
PROCEEDINGS
11 PAGES


SHARE
RELATED CONTENT

Lasing effect in blue phase liquid crystal
Proceedings of SPIE (September 11 2013)
Random lasing in a bistable smectic A liquid crystal
Proceedings of SPIE (May 08 2007)
Video microscopy of NCAP films the observation of LC...
Proceedings of SPIE (June 14 1992)
Lasing in disordered media
Proceedings of SPIE (July 02 2003)

Back to Top