Design of High-Efficiency Diffraction Gratings Based on Rigorous Coupled-Wave Analysis for 800 nm Wavelength

摘要

We report on the design of a high diffraction efficiency multi-layer dielectric grating with wide incident angle and broad bandwidth for 800 nm.The optimized grating can achieve ＞ 95% diffraction efficiency in the first order at an incident angle of 5° from Littrow and a wavelength from 770hm to 830nm,with peak diffraction efficiency of ＞ 99.5% at 800nm.The electric field distribution of the optimized multi-layer dielectric grating within the gratings ridge is 1.3 times enhancement of the incidence light,which presents potential high laser resistance ability.Because of its high-efficiency,wide incident,broad bandwidth and potential high resistance ability,the multi-layer dielectric grating should have practical application in Ti:sapphire laser systems.