空间插值在功率谱密度计算中的应用

为了提高光学元件波前中频PSD计算的精度和有效频谱宽度，提出了填补波前无效数据的双线性插值法和抑制欠采样噪声的六采样点插值法。模拟计算和实验结果表明:双线性插值法有效地保证了填充数据与真实数据的一致性,抑制了零填充方法引入的虚假中高频信息,使得填补后的PSD与原始PSD较好地吻合；六采样点插值法有效地分离了信号和欠采样噪声，使得有效PSD频谱上限从1/2 Nyquist频率提高到Nyquist频率。

Experimental study on wavefront correction in ultra-short laser facility

To improve beam quality and focusability performance, an adaptive optical system, which is based on the phase-conjugated principle and consists of Hartmann-Shack sensor, deformable mirror, control unit and software, was installed in the SILEX-I laser facility to correct its wavefront aberrations. The wavefront data and far-field focal spots were measured and analyzed. The results show that, the peak-valley value of the wavefront decreases from 1.885 μm to 0.438 μm and the root mean square value reduces from 0.379 μm to 0.052 μm with this adaptive optical system. In addition, the far-field focal spot is improved and the energy in the region where the intensity of each point is greater than 1/e2 of the laser beam peak intensity is 72.4% of the total energy after the wavefront aberrations