Using the nonperturbative scattering theory developed for multiphoton ionization with the inclusion of spontaneous emission, the angular differential rates for above-threshold ionization (ATI) are obtained. Besides the main lobe structure, our numerical calculations reproduce the fine structures in the angular distribution of ATI peaks observed by Nandor et al.. The fine structures are attributed to the spontaneous emissions when the photoelectron exits the laser field.

A multiply-angle spectra-resolved system was developed. The diagnostic can be used to measure scattered lights at six different observation angles from laser-produced plasmas simultaneously. This diagnostic consists of spectrometer, an array of 6 fibers, and light collectors. The 3ω 0/2 harmonic spectra were measured. The comparison between the observed spectra and a linear theory shows that the electron temperature in the corona of CH plasma produced by 1.053 μm laser is about 0.55 keV.

It was calculated and analysed that the ghost was produced from image transmission in SHENGUANG Ⅱ high power laser system. According to the calculated results the arrangement of optical elements which should be damaged by the ghost in the system was planned over.