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为了实现光参变放大抽运光源高稳定输出的目的。通过对倍频过程的数值模拟分析,提出倍频中存在“稳定区”的概念,在基频光强一定的条件下(小于倍频晶体破坏阈值),通过非共线双程倍频的方式或串联倍频的方式可有效延长倍频晶体的有效作用长度,保证倍频工作区能够被控制在“稳定区”内,从而实现高稳定高转换效率的倍频输出。实验数据验证了这一结论,实验中,利用非共线双程倍频的方式使得倍频工作区在“稳定区”内,对波动±5.7%的1064 nm高斯脉冲基频光,倍频光波动小于±2%,脉冲形状为高阶高斯脉冲,转换效率大于70%,实验结果表明,倍频光的稳定性指标相对于基频光提高了近3倍。
In order to achieve optical parametric amplification pumping light source high stability output purposes. Through the numerical simulation analysis of frequency doubling process, the concept of “stable zone” exists in frequency doubling. Under the condition of certain intensity of fundamental frequency (less than the threshold of frequency doubling crystal destruction) Or series frequency doubling mode can effectively extend the effective length of the frequency doubling crystal to ensure that the frequency multiplying work area can be controlled in the “stability zone”, in order to achieve high stability and high conversion efficiency multiplier output. The experimental data verify this conclusion. In the experiment, the non-collinear double-pass frequency multiplication method makes the frequency multiplying work area in the “stable area” The fluctuation is less than ± 2%, the pulse shape is high-order Gaussian pulse, and the conversion efficiency is more than 70%. The experimental results show that the stability index of frequency doubling light is nearly 3 times higher than the fundamental frequency light.