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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 25 — Dec. 6, 2010
  • pp: 25896–25905

All-optically controllable random laser based on a dye-doped liquid crystal added with a photoisomerizable dye

Chia-Rong Lee, Jia-De Lin, Bo-Yuang Huang, Ting-Shan Mo, and Shuan-Yu Huang  »View Author Affiliations

Optics Express, Vol. 18, Issue 25, pp. 25896-25905 (2010)

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This study investigates, for the first time, an all-optically controllable random laser based on a dye-doped liquid crystal (DDLC) cell added with a photoisomerizable dye. Experimental results indicate that the lasing intensity of this random laser can be all-optically controlled to decrease and increase sequentially with a two-step exposure of one UV and then one green beam. All-optically reversible controllability of the random lasing emission is attributed to the isothermal nematic(N)→isotropic(I) and I→N phase transitions for LCs due to the UV-beam-induced transcis and green-beam-induced cistrans back isomerizations of the photoisomerizable dye, respectively. The former and the latter can decrease and increase the spatial fluctuations of the order and thus of the dielectric tensor of LCs, respectively, subsequently increasing and decreasing the diffusion constant (or transport mean free path), respectively, and thus decaying and rising the scattering strength for the fluorescence photons in their recurrent multi-scattering process, respectively. The consequent decrease and increase of the lasing intensity for the random laser and thus the rise and descent of its energy threshold are generated, respectively.

© 2010 OSA

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(160.3710) Materials : Liquid crystals
(230.1150) Optical devices : All-optical devices
(290.4210) Scattering : Multiple scattering

ToC Category:
Lasers and Laser Optics

Original Manuscript: October 22, 2010
Revised Manuscript: November 24, 2010
Manuscript Accepted: November 24, 2010
Published: November 25, 2010

Chia-Rong Lee, Jia-De Lin, Bo-Yuang Huang, Ting-Shan Mo, and Shuan-Yu Huang, "All-optically controllable random laser based on a dye-doped liquid crystal added with a photoisomerizable dye," Opt. Express 18, 25896-25905 (2010)

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