二极管双侧抽运横流连续液体激光系统性能模拟

为解决无机液体激光系统的热效应问题,采用激光二极管双侧抽运横向流动的Nd3 :POCl3:ZrCl4溶液以很好地减小热效应,实现液体激光系统高功率高光束质量输出。建立了液体激光理论模型,分析了工作参量对系统能量转换效率与介质热效应的影响;模拟了系统在不同吸收系数和不同流速下的能量转换效率,远场光斑分布以及激光束亮度分布。模拟结果表明:采用二极管作为抽运源可以获得很高的能量转换效率,而且光束质量较好;在给定抽运体积和抽运强度为800 W/cm2时,介质的吸收系数位于2.5~3.0 cm-1,流速约为25 m/s时,输出功率与光束质量实现最佳匹配,激光束亮度最高,系统性能达到最佳。

Performance Simulation of Laser Diode Two-Sides-Pumped Transverse Flow Continuous Liquid Laser

The laser diode (LD) two-sides-pumped transverse flow Nd3+∶POCl3∶ZrCl4 solution is adopted to eliminate the thermal effects in an inorganic liquid laser system. The theoretical model for a liquid laser is established, the influence of working parameters on the energy conversion efficiency and medium thermal effect is analyzed, and the energy conversion efficiency, the far field intensity and the laser beam luminance distributions at different absorbing coefficient and different velocity of flow are simulated. The simulation shows that the energy-conversion efficiency is very high and the light beam quality is excellent with a laser diode pump source. The output power and laser beam quality match best and the laser beam luminance reaches a peak value when the absorbing coefficient is about 2.5～3.0 cm-1, the velocity of flow is about 25 m/s and the unilateral pump intensity is 800 W/cm2 at a determined pumping volume.