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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。
In order to solve the thermal effect of the inorganic liquid laser system, laser diode was used to pump the lateral flow of Nd3 +: POCl3: ZrCl4 solution to reduce the thermal effect and achieve the high power and high beam quality output of the liquid laser system. The theoretical model of liquid laser was established. The influence of working parameters on the system energy conversion efficiency and medium thermal effect was analyzed. The energy conversion efficiency, far-field spot distribution and laser beam brightness distribution under different absorption coefficients and flow velocities were simulated. The simulation results show that the diode can be used as pumping source to obtain high energy conversion efficiency and good beam quality. The absorption coefficient of the medium is 2.5-3.0 for a given pumping volume and pumping strength of 800 W / cm2 cm-1 at a flow rate of about 25 m / s, the output power and beam quality to achieve the best match, the highest laser beam brightness, system performance to achieve the best.