Abstract

Nowadays, mirrorless lasing from dye-doped cholesteric liquid crystals (CLCs) have attracted much attention. To produce the CLCs, chiral materials are mixed into the nematic LCs and thus the rod-like LC molecules self-assembly aligned and rotated regularly along the helical axis to produce the one-dimensional photonic bandgap. The wavelength at long- and short-photonic band edges (λ_LWE and λ_SWE) are characterized by the relation λ_LWE = n_ep and λ_SWE = n_op [1] in which p is helical pitch, where n_e and n_o are extraordinary and ordinary refractive index. For the CLC lasers, the photon density will be enhanced at two bandedge so as to lower the lasing threshold [2]. Traditionally, the dye-doped CLC was infill into the cell constructed by the glass plate [3, 4]. In this work, we filled the dye-doped CLCs into the capillary tube to investigate the occurrence two lasing emission mode at bandedge of the photonics bandgap.

© 2014 Japan Society of Applied Physics, Optical Society of America