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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 3 — Feb. 2, 2009
  • pp: 2042–2047

Thermo-recurrent nematic random laser

S. Ferjani, A. De Luca, V. Barna, C. Versace, and G. Strangi  »View Author Affiliations


Optics Express, Vol. 17, Issue 3, pp. 2042-2047 (2009)
http://dx.doi.org/10.1364/OE.17.002042


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Abstract

This experimental work is aimed to investigate the thermal behavior of random laser action in dye doped nematic liquid crystals. The study evidenced an important temperature dependence of the random lasing characteristics in the nematic phase and in close proximity of the nematic -isotropic (N-I) phase transition. A lowering of the laser emission intensity as the temperature increases is strictly related to the shift of the lasing threshold as function of the temperature even though the pump energy is kept fixed. The optical losses increasing owing to the thermal fluctuation enhanced scattering drive the input-output smoother behavior until the system stops to lase, because below threshold. The unexpected reoccurrence of random lasing at higher temperature, in proximity of N-I transition is found to be related to a different scattering mechanism, the micro-droplets nucleation and critical opalescence.

© 2009 Optical Society of America

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.6810) Lasers and laser optics : Thermal effects
(160.3710) Materials : Liquid crystals
(290.4210) Scattering : Multiple scattering

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: November 24, 2008
Revised Manuscript: December 15, 2008
Manuscript Accepted: December 15, 2008
Published: January 30, 2009

Citation
S. Ferjani, A. De Luca, V. Barna, C. Versace, and G. Strangi, "Thermo-recurrent nematic random laser," Opt. Express 17, 2042-2047 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-3-2042


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