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高功率固体激光装置主放大器是能量提取最多的一个环节,它受环境影响因素较多,难以建立考虑各因素影响的微观模型。目前,国内外还没有主放大器增益的精确预测模型和实验数据分析报道,现有预测模型较为粗糙。从统计角度对高功率激光装置主放大器增益的变换规律进行了分析,指出宏观上3种不同特点的增益变化,分别为增益的低频演化规律、增益随日运行发次的变化规律及增益的高频稳定性特性;并由此建立了包含权重因子的主放输出预测模型。通过神光Ⅲ原型装置的运行数据对建立的模型进行了考核,结果显示,与以往的单一发次的递推模型相比,新模型对增益预测的准确性可提高1倍。研究结果对大型固体激光装置的高效运行具有指导意义。
High-power solid-state laser device main amplifier is one of the most energy extraction steps, it is subject to many environmental factors, it is difficult to establish a micro-model considering the impact of various factors. At present, there are no accurate prediction models and experimental data analysis reports of the main amplifier gains at home and abroad, and the existing prediction models are relatively rough. From the statistical point of view, the principle of the gain of the main amplifier in a high power laser device is analyzed. The gain variations of the three different macroscopic characteristics are pointed out. They are the low frequency evolution of gain, the variation of gain with the number of times of daily operation, and the high gain Frequency stability, and the main output output forecasting model with weighting factor is established. The model was evaluated through the operation data of the SGS prototype device. The results show that the new model can improve the accuracy of gain prediction by one time compared with the conventional one-time recurrence model. The research results are instructive for the efficient operation of large solid-state laser devices.