This paper presents the first systematic study on second harmonics generation based on a supercontinuum source. We analyzed the effect of the supercontinuum beam diameter and the crystal length to generate second harmonics. The walk-off effect on the second harmonics was also investigated; the efficiency was limited by the walk-off, and the beam of the second harmonic was out of shape. A tunable ultraviolet in the range of 285–340 nm is obtained with the pump of a visible supercontinuum, which is generated by a laser with an all-fiber device. The results provide a theoretical basis for the improvement of the second harmonic power and optimization of the crystal and beam diameters. A potentially tunable ultraviolet with a power exceeding 10 mW can be obtained by a high-power supercontinuum pump.

中文翻译：

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超连续谱激光器泵浦的可调谐紫外二次谐波产生

本文首次对基于超连续谱源的二次谐波产生进行了系统研究。我们分析了超连续谱光束直径和晶体长度对产生二次谐波的影响。对二次谐波的走离效应也进行了研究；效率受到走离的限制，二次谐波的光束变形。285-340 nm 范围内的可调紫外光是通过可见光超连续谱的泵浦获得的，该超连续谱是由带有全光纤装置的激光器产生的。研究结果为二次谐波功率的提高和晶体和光束直径的优化提供了理论依据。通过高功率超连续泵可以获得功率超过 10 mW 的潜在可调紫外线。