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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 19 — Sep. 12, 2011
  • pp: 18199–18206

Novel dye-doped cholesteric liquid crystal cone lasers with various birefringences and associated tunabilities of lasing feature and performance

Shih-Hung Lin and Chia-Rong Lee  »View Author Affiliations


Optics Express, Vol. 19, Issue 19, pp. 18199-18206 (2011)
http://dx.doi.org/10.1364/OE.19.018199


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Abstract

This study is the first to investigate novel cone lasers and the tunabilities of their lasing feature and performance based on dye-doped cholesteric liquid crystal (DDCLC) films with various LC birefringences (Δn). A unique conically-symmetric lasing ring with a low energy threshold occurs at a specific nonzero oblique angle (θring). The low energy threshold is comparable to those for common lasing signals occurring simultaneously at the short- and long-wavelength edges (SWE and LWE) of the CLC reflection band (CLCRB) for 0°. The lasing ring is induced by the enhancement in the density of photonic state for the fluorescence with a wavelength of λring based on an edge-overlapping effect, in which λring is just located at an edge-overlapping spectral position of the SWE of the CLCRB for 0° and the LWE of the CLCRB for θring. The lasing feature (i.e., the lasing wavelengths of the three lasing signals and the emitted angle of the lasing ring) are tuned by varying Δn. The simulated relationship of an oblique angle with Δn, in which the SWE of the CLCRB for that oblique angle just overlaps the LWE of the CLCRB for 0°, can be obtained by calculating the dispersion relation of a planar CLC structure with various values of Δn based on Berreman’s 4 × 4 matrix approach. The result of the calculation is highly consistent with the experimental data for the dependence of θring on Δn. Furthermore, the dependence of lasing performance (energy threshold and relative slope efficiency) on Δn for the three lasing signals is also measured, which findings can be used to qualitatively identify positive interaction or competition among the three lasing signals.

© 2011 OSA

OCIS Codes
(140.3490) Lasers and laser optics : Lasers, distributed-feedback
(140.3600) Lasers and laser optics : Lasers, tunable
(160.3710) Materials : Liquid crystals
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: July 1, 2011
Revised Manuscript: August 10, 2011
Manuscript Accepted: August 22, 2011
Published: September 1, 2011

Citation
Shih-Hung Lin and Chia-Rong Lee, "Novel dye-doped cholesteric liquid crystal cone lasers with various birefringences and associated tunabilities of lasing feature and performance," Opt. Express 19, 18199-18206 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-19-18199


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References

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