Despite numerous efforts, continuous wave (CW) lasing in dye doped, one-dimensional (1D) photonic bandgap cholesteric liquid crystal (CLC) structures has not been previously reported, to our knowledge. Here we report on the observation of lasing in such structures under both coherent (laser) and incoherent (LED) CW light excitation. To achieve this effect, we used a 1D-photonic bandgap structure made of a polymer stabilized CLC with a pitch gradient across the cell thickness. A spectral reflectivity profile of such a CLC structure reveals local minima in the area within a photonic stopband and close to it. The realization of lasing pumped by low power CW light sources opens the possibility of all-organic, compact, tunable CW lasers for display and medical applications.
© 2012 Optical Society of AmericaFull Article | PDF Article
Ying Zhou, Yuhua Huang, and Shin-Tson Wu
Opt. Express 14(9) 3906-3916 (2006)
Guram Chilaya, Andro Chanishvili, Gia Petriashvili, Riccardo Barberi, Maria P. De Santo, and Mario A. Matranga
Opt. Express 14(21) 9939-9943 (2006)
Ying Zhou, E-Eun Amy Jang, Yuhua Huang, and Shin-Tson Wu
Opt. Express 15(6) 3470-3477 (2007)