Numerical simulation of actively Q-switched intracavity sum-frequency Raman laser
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摘要: 推导了LD泵浦主动调Q腔内和频拉曼激光器的归一化速率方程组，由实际的实验参数确定了方程组中七个综合参量的合理取值范围，然后用数值模拟的方法得到各个综合参量的大小对于和频光的脉冲峰值功率、单脉冲能量和脉冲宽度的影响，分析发现归一化和频因子F和归一化拉曼增益系数M之间能够相互匹配，通过数值拟合得到F和M在不同归一化反转粒子数密度N下的匹配方程，由此得出F和M的匹配值呈线性关系，应用此线性方程可以指导实验中参数的优化，使激光器获得更大的和频转换效率。最后利用拟合的结论对报道的实验进行计算和分析并给出优化措施。Abstract: The normalized rate equations of the LD pumped actively Q-switched intracavity sum-frequency Raman laser were deduced, and the reasonable value scope of seven comprehensive factors of the rate equations was estimated respectively according to the parameters of typical experimental setups. The influences of the comprehensive factors on the laser output peak power, single pulse energy and pulse width were researched by the numerical simulation of the actively Q-switched intracavity sum-frequency Raman laser. It was found that there was a matching relation between the normalized sum-frequency factor F and the normalized Raman gain coefficient M, and the matching equations and curves of F and M at different inversion population density N were obtained by making use of the method of numerical fitting, the result demonstrates that the matching values of F and M are basically linearly related, which can be employed to guide the optimization of parameters of the length of Raman medium and sum-frequency crystal in the experiment to accomplish the high efficient sum-frequency laser. Finally, the results are used to calculate and analyze the reported experiment to optimize the parameters of setups to gain higher output power and more efficient laser.
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Key words:
- sum-frequency /
- actively Q-switched /
- Raman laser /
- rate equations /
- numerical simulation
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