无外加氟施主产生KrF准分子发射谱实验研究

Suppression for the Low-spatial-frequency Rings and Ripples of Laser Near-field Intensity Distribution in the Spatial Filter Used in ICF Laser Drive

We report a new technique to suppress the low-spatial-frequency rings and ripples (LSFRs) of laser near-field intensity distribution in the spatial filter (SF) used in ICF laser drivers. This technique employs a spatial filter with Gaussian transmission, instead of the hard-edged pinhole, at the confocal plane of a Newtonian telescope. The resulting beam has a super-Gaussian transverse intensity profile without the LSFRs that certainly appear when a hard-pinhole was used as a filter in the conventional technique.