超高斯光束在超短脉冲激光系统中的传输
Propagation of the super-Gaussian beam in Ti:sapphire CPA system
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摘要: 为了增大光束的填充因子及提高放大器的能量转换效率，设计了一种新型的空间4程放大器，该放大器包括四组由凹面镜组成的空间滤波器，它们构成一个全像传递系统。由于有实焦点，放大器置于真空系统中。放大前，入射的高斯光束首先通过一个软边光阑和一个空间滤波器，被整形为高阶超高斯光束，然后在放大器中进行放大和像传递。钛宝石晶体置于各空间滤波器的像面和物面上。实验表明，该放大器结构稳定，可以保持良好的光束质量，远场焦斑达到近一倍衍射极限。Abstract: In order to improve the filled factor of beam and the conversion efficiency of amplifier, with reference to the technical integrated line of Shenguang-Ⅲ, a kind of new spatial four-pass amplifier structure is designed, which is made up of four pairs of spatial filters, in the Ti:sapphire CPA system. The spatial structure amplifier is put in a vacuum because there are real focus points in the amplifier. Before amplification, the input Gauss beam firstly goes through a diaphragm and then a static spatial filter with a pinhole, the beam is refitted into a 4th order super-gaussian beam. Then, the image of super-gaussian beam is relayed to the first spatial filter of amplifier. The Ti:sapphire crystal is put at the surface of image or object of the spatial filters for the sake of the good qual
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Key words:
- ti:sapphire /
- cpa(chirped pulse amplification) /
- spatial filter /
- image relayed /
- near field /
- far field
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