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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 33, Iss. 6 — Mar. 15, 2008
  • pp: 557–559

Random lasing in freely suspended dye-doped nematic liquid crystals

Sameh Ferjani, Valentin Barna, Antonio De Luca, Carlo Versace, and Giuseppe Strangi  »View Author Affiliations

Optics Letters, Vol. 33, Issue 6, pp. 557-559 (2008)

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Random lasing in fully disordered systems having organic and inorganic nature has been the subject of extensive studies since the beginning of the past decade. The interest mainly emerges from the unexpected role played by disorder in the laser action. The disorder was considered detrimental for the optical feedback in cavity laser, until it was demonstrated that multiple-scattering materials including a gain medium act as random laser. Here, a completely new approach is reported, where freely suspended complex fluid films doped with fluorescent molecules under optical excitation generate narrowband lasing peaks. The constellation of localized modes is selected by properly choosing the gain profile. The idea to have laser action in absence of mirrors and boundaries realizes an unparalleled tunable and moldable laser source.

© 2008 Optical Society of America

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(160.3710) Materials : Liquid crystals

ToC Category:
Lasers and Laser Optics

Original Manuscript: November 30, 2007
Revised Manuscript: February 8, 2008
Manuscript Accepted: February 8, 2008
Published: March 11, 2008

Sameh Ferjani, Valentin Barna, Antonio De Luca, Carlo Versace, and Giuseppe Strangi, "Random lasing in freely suspended dye-doped nematic liquid crystals," Opt. Lett. 33, 557-559 (2008)

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