Research of dye-doped cholesteric nematic liquid crystal laser characteristic

Dye-doped cholesteric liquid crystal laser was designed and manufactured, and the output characteristic of the device was measured and analyzed. The cholesteric liquid crystal laser device of planar alignment state texture was prepared by doping laser dye DCM and chiral compound S-811 into nematic liquid crystal TEB30A. By using doubled frequency 532 nm Nd:YAG pulsed laser as pumping source to pump the device, the band edge lasing emission was obtained at 607 nm and 680 nm. The line-width was less than 0.5 nm. Then the energy threshold characteristic of the laser and the energy distribution of the lasing spot were measured and analyzed. In the liquid crystal device, photonic density of states is greatest at the edge of the photonic band gap, threshold is lower and laser radiation is obtained easily.