Opt Lett. 2013 Oct 15;38(20):4011-4. doi: 10.1364/OL.38.004011.
The wavefront of an injection-seeded soft x-ray laser beam generated by amplification of high-harmonic pulses in a λ=18.9 nm molybdenum plasma amplifier was measured by a Hartmann wavefront sensor with an accuracy of λ/32 root mean square (rms). A significant improvement in wavefront aberrations of 0.51±0.03λ rms to 0.23±0.01λ rms was observed as a function of plasma column length. The variation of wavefront characteristic as a function time delay between the injection of the seed and peak of soft x-ray amplifier pump was studied. The measurements were used to reconstruct the soft x-ray source and confirm its high peak brightness.
采用哈特曼波前传感器测量了在λ=18.9nm 钼等离子体放大器中放大高次谐波脉冲产生的注入种子软 X 射线激光光束的波前，其精度达到λ/32 均方根（rms）。随着等离子体柱长度的增加，波前像差从 0.51±0.03λ rms 显著改善至 0.23±0.01λ rms。研究了注入种子和软 X 射线放大器泵浦峰值之间的时间延迟对波前特性的影响。这些测量用于重建软 X 射线源，并证实其具有高的峰值亮度。
