Abstract
Lasing stability in dye-doped cholesteric liquid crystal (ChLC) lasers largely depends on repetition frequency of the pumping laser, and therefore stabilization of output power under quasi-continuous-wave operation with high repetition frequency greater than 1 kHz is a tough challenge. In this study, a significant improvement of lasing stability in dye-doped ChLC lasers is obtained by lowering dye concentration, increasing cell gap, and moving LC cells with a piezo stage. Considering the balance between lasing stability and slope efficiency, the optimal conditions regarding cell gap and dye concentration in a ChLC laser doped with Pyrromethene 597 are determined to be 50 μm and 0.3 wt%, respectively. Under severe conditions of high repetition frequencies of 1 kHz and 10 kHz, the optimized ChLC laser demonstrates durability retaining 100% and more than 72% against the initial output power for 30 min, respectively.
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