Abstract
Although a large number of studies have been made on low-threshold laser oscillation using the photonic structure in chiral nematic liquid crystals, little is known about the stability. In this report, band-edge lasing of liquid crystal samples doped with common laser dyes was carried out, and the stability was investigated. Coumarin doped sample that requires UV light (370 nm) excitation lased only a short time. On the other hand, DCM and pyrromethe pumped by visible light (530 nm) was lased over the long time. Reducing the threshold pumping energy by optimization of a sample, we demonstrated long-lifetime laser oscillation at least 10^7 or more shots.
