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Comparative study on second harmonic conversion and saturation characteristics of three copper vapor laser beams of same average power and different spatial coherence

机译：三种平均功率相同但空间相干性不同的铜蒸气激光束的二次谐波转换和饱和特性的比较研究

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摘要

This paper presents a comparative study on second harmonic conversion and saturation behavior of three copper vapor laser (CVL) beams of same average power up to 11 W (510 nm), however with different spatial coherence width of 17%, 35%, and 100% of the full beam cross-section. The nonlinear crystal employed is beta barium borate. It is observed that the trends in second harmonic (SH) conversion efficiency and its saturation are widely different for the three CVL pump beams. As expected, the conversion efficiency scaled up with increase in pump power. However, very interesting trends are observed in SH saturation characteristics with scaling of pump beams spatial coherence. For lower coherence CVL beam, the saturation of SH efficiency is observed at lower pump flux and at higher average power. Also, the saturation occurred at lower SH efficiency for CVL beam of lower spatial coherence. The fall in the SH efficiency after the peak is more rapid for lower spatial coherence pump beam. The experimental trends are explained in terms of combined effect degree of spatial coherence of pump beams and the thermal de-phasing in the nonlinear crystal by high pump average power.
机译：本文对三种平均功率高达11 W（510 nm），但空间相干宽度分别为17％，35％和100的相同功率的三个铜蒸气激光（CVL）光束进行了二次谐波转换和饱和特性的比较研究全光束横截面的百分比。使用的非线性晶体是β硼酸钡。可以看出，对于三个CVL泵浦光束，二次谐波（SH）转换效率及其饱和度的趋势差异很大。如预期的那样，转换效率随着泵浦功率的增加而扩大。但是，随着泵浦光束空间相干性的缩放，在SH饱和特性中观察到非常有趣的趋势。对于相干性较低的CVL光束，在较低的泵浦通量和较高的平均功率下会观察到SH效率的饱和。同样，对于较低空间相干性的CVL光束，饱和在较低的SH效率下发生。对于较低的空间相干泵浦光束，峰值后SH效率的下降更为迅速。用泵浦光束的空间相干效应和非线性晶体由于高泵浦平均功率引起的热相移的综合影响程度来解释实验趋势。

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