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在直接驱动激光聚变中,变焦辐照可使得激光焦斑随聚变靶丸缩小,可增大激光与靶的能量耦合效率。基于像传递技术并利用电光削波开关中的检偏棱镜同时实现光脉冲的分束与波形分割,这种方式可充分利用脉冲激光能量,可有多种光束分割形式,并具备脉冲整形的能力。在实验室实现了Xe Cl准分子激光3台阶变焦辐照,以条纹相机记录了焦斑变化过程。实验结果表明,电光削波开关中电光晶体驱动电压的前沿陡度直接影响到变焦台阶之间的边界陡度。
In the direct-drive laser fusion, the zoom irradiation can make the laser focal spot shrink with the fusion target, which can increase the energy coupling efficiency between the laser and the target. Based on the image transfer technology and using the prism in the electro-optic clipping switch, the splitting and waveform splitting of light pulses can be realized at the same time. This method can make full use of pulsed laser energy, have many beam splitting forms and have pulse shaping capability . In the laboratory, Xe Cl excimer laser 3-step zoom irradiation was implemented, and the change of focal spot was recorded by a streak camera. The experimental results show that the sharpness of the leading edge of the electro-optic crystal driving voltage in the electro-optic chopping switch directly affects the steepness of the boundary between the zooming steps.