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Optical Properties of Laser Lines and Fluorescent Spectrum in Cholesteric Liquid Crystal Laser

Title
Optical Properties of Laser Lines and Fluorescent Spectrum in Cholesteric Liquid Crystal Laser
Authors
Jeong, Mi-YunChung, Ki SooWu, J. W.
Ewha Authors
우정원
SCOPUS Author ID
우정원scopus
Issue Date
2015
Journal Title
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
ISSN
1533-4880JCR Link1533-4899JCR Link
Citation
vol. 15, no. 10, pp. 7632 - 7639
Keywords
Optical Properties of the Laser LinesFluorescence EnhancementFluorescence Spectrum ControlCholesteric Liquid Crystal Laser
Publisher
AMER SCIENTIFIC PUBLISHERS
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We experimentally studied the comprehensive optical properties of the laser lines and fluorescent spectrum generated by a continuous tunable cholesteric liquid crystal (CLC) laser array. We found that the laser lines generated from a CLC with a right-handed circular helix were right-handed circular polarized and laser lines generated from a CLC with a left-handed circular helix were left-handed circular polarized. Inside the photonic band gap, the CLC structure with right-(left-) handed helicity suppressed the fluorescence generated with right (left) circular polarized light, and instead the suppressed right (left) circular polarized light energy moved to the outside of the photonic band gap, so we can say that the fluorescence intensity outside of the photonic band gap is enhanced with right (left) handed circular polarized light. Depending on the position of the photonic band gap, the fluorescence quantum yield value increased by up to similar to 15%. These enhanced fluorescence intensities at the PBG edge will evolve into lasing at the upper lasing threshold. It is particularly interesting to see that the fluorescence intensity and shape could be controlled by adjusting the external geometrical factor of the photonic band gaps. The lasing threshold of the CLC lasers was in the range of 1.5-5.3 mu J/pulse. For CLC laser device applications, it is necessary and essential to know the optical properties of the generated laser lines and of the fluorescence spectrum.
DOI
10.1166/jnn.2015.11176
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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