Vector theory analysis and numerical calculation for beam sampling grating used in ICF

Beam sampling grating are used to sending a known fraction of transmitted light into a calormeter for energy diagnostics in final focusing optical system of ICF. This paper discusses diffractive efficiency as a function of period, depth, duty cycle and incident angel. The algorithm that we applied is rigorous coupled-wave analysis. By calculation, we can get some useful informations for practical fabrication of the beam sampling grating.