兼容LITMoS测试的多能级光学制冷模型

Universal Modeling Method and Simulation Study of Ho:YLF Multi-Level Optical Refrigeration System

摘要: 本文基于Ho:YLF晶体在负调谐抽运下的速率方程理论模型，分析其涉及到能量传递上转换的能级跃迁具体过程，在考虑ETU过程对激光制冷影响的前提下，建立了一套兼容LITMoS测试的普适性多能级制冷模型，来研究涉及到多种能量传递的制冷过程。理论推导结合数值模拟，协同二能级模型对多能级制冷模型的拟合效果进行比对验证，并对其在不同温度情况下的适用性进行分析，与二能级模型相比，多能级模型在拟合实验数据方面提升了22.26%的精确度。随着系统温度的降低，制冷效率呈现出下降趋势。当泵浦光强增大时，制冷效率呈现下降趋势。

Abstract: Based on the rate equation theoretical model of Ho:YLF crystal under negative tuning pumping, analyze the specific process of energy transfer involving upconversion level transitions. Considering the influence of the ETU process on laser cooling, establish a universal multi-level refrigeration model compatible with LITMoS testing to study refrigeration processes involving multiple energy transfers. Theoretical derivation combined with numerical simulation compares and verifies the fitting effect of the multi-level refrigeration model with the two-level model and analyzes its applicability under different temperature conditions. Compared with the two-level model, the multi-level model improves the accuracy of fitting experimental data by 22.26%. As the system temperature decreases, the refrigeration efficiency shows a decreasing trend.