基于棱镜实现三倍频谐波分离

基于棱镜的色散特性,提出一种楔形窗口与聚焦透镜组合的方式,解决了高功率激光装置三倍频谐波分离所存在的问题,即三倍频的高通量传输和靶面辐照。结合“神光Ⅱ”装置多功能高能激光系统有关参数进行系统设计,确定了楔形窗口参数,并对其所引起的B积分和间距误差进行了分析。通过实验测试,三倍频传输通量由0.7～1 J/cm2提高到2.8 J/cm2,同时靶面三倍频和二倍频分离间距达到2.85 mm,实现了高功率激光装置高通量传输的三倍频谐波分离。

In order to realize the third harmonic propagating at high-power and irradiating target, a method based on the combination of wedge window and focus lens has been proposed to serve the important function of angularly dispersing the unconverted the fundamental and second harmonic away from the third harmonic target in high power laser facility. Based on the multifunctional and high-power laser system of “Shenguang-Ⅱ” facility, the wedge window is designed. And resulted from the wedge window, the B-integral and the space error between the second harmonic and third harmonic are analyzed. In experiment, the third harmonic propagating at high-power has been improved from 0.7～1 J/cm2 to 2.8 J/cm2, and the space is up to 2.85 mm at the third harmonic target. The method can be used to achieve the third harmonic splitter in high power laser facility.