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分析了超短超强激光系统中有限尺寸光栅压缩器设计的关键物理参数及约束条件,得到了压缩器优化的三项基本变量。给出了一种输出能量最大化的压缩器优化方法,进而确定了有限尺寸光栅压缩器的最大工作能力。针对传统的圆光束方案提出了改进的椭圆光束方案,增大了聚焦能量,减小了焦斑尺寸,提高了峰值聚焦功率密度。通过数值模拟对500 mm曝光口径介质膜光栅在圆光束和椭圆光束两种方案下的最大输出能力进行分析比较,指出单块光栅在椭圆光束方案下可以实现500 fs,500 J,1 PW的脉冲输出。
The key physical parameters and constraints for the design of finite size grating compressor in ultrashort superlattice laser system are analyzed. Three basic variables of compressor optimization are obtained. A method of compressor optimization to maximize output energy is given, and the maximum working capacity of a finite-size grating compressor is determined. Aiming at the traditional circular beam scheme, an improved elliptical beam scheme is proposed, which increases the focusing energy, reduces the focal spot size and increases the peak focusing power density. The numerical simulation is used to analyze and compare the maximum output capability of a 500 mm aperture diaphragm with a circular beam and an elliptical beam. It is pointed out that a single grating can achieve pulses of 500 fs, 500 J and 1 PW under the elliptical beam scheme Output.