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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 21 — Oct. 8, 2012
  • pp: 23978–23984

Random lasing in blue phase liquid crystals

Chun-Wei Chen, Hung-Chang Jau, Chun-Ta Wang, Chun-Hong Lee, I. C. Khoo, and Tsung-Hsien Lin  »View Author Affiliations

Optics Express, Vol. 20, Issue 21, pp. 23978-23984 (2012)

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Random lasing actions have been observed in optically isotropic pure blue-phase and polymer-stabilized blue-phase liquid crystals containing laser dyes. Scattering, interferences and recurrent multiple scatterings arising from disordered platelet texture as well as index mismatch between polymer and mesogen in these materials provide the optical feedbacks for lasing action. In polymer stabilized blue-phase liquid crystals, coherent random lasing could occur in the ordered blue phase with an extended temperature interval as well as in the isotropic liquid state. The dependence of lasing wavelength range, mode characteristics, excitation threshold and other pertinent properties on temperature and detailed make-up of the crystals platelets were obtained. Specifically, lasing wavelengths and mode-stability were found to be determined by platelet size, which can be set by controlling the cooling rate; lasing thresholds and emission spectrum are highly dependent on, and therefore can be tuned by temperature.

© 2012 OSA

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(160.3710) Materials : Liquid crystals
(290.4210) Scattering : Multiple scattering

ToC Category:
Lasers and Laser Optics

Original Manuscript: July 30, 2012
Revised Manuscript: September 28, 2012
Manuscript Accepted: September 28, 2012
Published: October 4, 2012

Chun-Wei Chen, Hung-Chang Jau, Chun-Ta Wang, Chun-Hong Lee, I. C. Khoo, and Tsung-Hsien Lin, "Random lasing in blue phase liquid crystals," Opt. Express 20, 23978-23984 (2012)

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