基于超高斯特征的固体激光器输出特性研究

Research on Output Characteristics of Solid-State Laser Based on Super-Gaussian Features

【目的】以超高斯数学模型为基础,选用不同的超高斯分布阶数,对Nd:GdVO4的1342 nm固体激光器输出特性情况进行试验测量及数据分析,验证符合泵浦光实际抽运分布的数学模型。【方法】以半导体激光器为泵浦源,采用平凹腔腔型结构,在25℃的LD温度和20℃的冷却水温度条件下进行测试。【结果】试验结果表明,当入射功率持续增加时,输出功率与入射功率呈线性关系。泵浦功率大于10 W后,超高斯分布的输出特性与高斯分布有明显区别,且随着超高斯阶数m的增加,输出功率也随之增加。试验测试数据与m为2时的超高斯分布计算结果基本一致,优于m为1时的高斯分布计算结果。【结论】试验结果与m为2时的抽运光超高斯分布模型最符合,从而验证了泵浦光超高斯分布模型比高斯分布模型更加符合实际强度分布。

[Purposes]This paper is based on the super-Gaussian mathematical model,and the output characteristics of 1342 nm Nd:GdVO4 solid-state laser are measured and analyzed with different order of super-Gaussian distribution.It is ultimately verified that the mathematical model is conformed to the actual pumping distribution of the pump light.[Methods]Using semiconductor laser as the pump source in the experiment and adopting flat concave cavity structure,the tests were carried out at the LD temperature of 25℃and the cooling water temperature of 20℃.[Findings]With the increase of incident power,the output power has a linear relationship with the incident power.When the pump power is greater than 10 W,the output characteristics of the super-Gaussian distribution are significantly different from those of the Gaussian distribution and with the increase of the super-Gaussian order m,the output power also increases.The experimental test data is basically consistent with the calculation results of the super-Gaussian distribution when m is 2,which is better than the calculation results of the Gaussian distribution when m is 1.[Conclusions]The experimental results are most consistent with the pump light super-Gaussian distribution model when m is 2,which verifies that the super-Gaussian distribution model of pump light is more consistent with the actual intensity distribution than the Gaussian distribution model.