Temperature-tunable lasing in negative dielectric chiral nematic liquid crystal

doi:10.1088/1674-1056/24/5/054211

Abstract In this work, negative dielectric nematic liquid crystal SLC12V620-400, chiral dopant S811, and laser dye DCM are used to prepare dye-doped chiral nematic liquid crystal laser sample. In order to investigate temperature-tunable lasing in negative dielectric chiral nematic liquid crystal, we measure the transmission and lasing spectrum of this sample. The photonic band gap (PBG) is observed to red shift with its width reducing from 71.2 nm to 40.2 nm, and its short-wavelength band edge moves 55.3 nm while the long-wavelength band edge only moves 24.9 nm. The wavelength of output laser is found to red shift from 614.4 nm at 20 ℃ to 662.8 nm at 67 ℃, which is very different from the previous experimental phenomena. The refractive indices, parallel and perpendicular to the director in chiral nematic liquid crystal have different dependencies on temperature. The experiment shows that the pitch of this chiral nematic liquid crystal increases with the increase of temperature. The decrease in the PBG width, different shifts of band edges, and the red shift of laser wavelength are the results of refractive indices change and pitch thermal elongation.

Keywords: liquid crystal laser temperature-tunable lasing negative dielectric liquid crystal

Received: 10 September 2014
Revised: 04 December 2014
Accepted manuscript online:

PACS:	42.70.Df	(Liquid crystals)
	42.55.Mv	(Dye lasers)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61378042), the Outstanding Young Scholars Growth Plans of Colleges and Universities in Liaoning Province, China (Grant No. LJQ2013022), the Science and Technology Research of Liaoning Province, China (Grant No. L2010465), the Open Funds of Liaoning Province Key Laboratory of Laser and Optical Information of Shenyang Ligong University, China.

Corresponding Authors: Dai Qin
E-mail: daiqin2003@126.com

About author: 42.70.Df; 42.55.Mv

Cite this article:

Wu Ri-Na (乌日娜), Wu Jie (吴杰), Wu Xiao-Jiao (邬小娇), Dai Qin (岱钦) Temperature-tunable lasing in negative dielectric chiral nematic liquid crystal 2015 Chin. Phys. B 24 054211

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