Comparison of the performance of photonic band-edge liquid crystal lasers using different dyes as the gain medium

摘要: The primary concern of this work is to study the emission characteristics a series chiral nematic liquid crystal lasers doped with different laser dyes (DCM, pyrromethene 580, and 597) at varying concentrations by weight (0.5–2 wt %) when optically pumped 532 nm. Long-wavelength photonic band-edge characterized in terms threshold energy slope efficiency. At every dye concentration investigated, 597-doped exhibit highest efficiency (ranging from 15% 32%) DCM-doped lowest 5% 13%). Similarly, was found be, general, higher for samples comparison pyrromethene-doped samples. These results are then compared spectral properties, quantum efficiencies and, where possible, fluorescence lifetimes dispersed common host. In accordance low thresholds high efficiencies, show that ...