Four equal-intensity laser output and physical analysis generated by reflective grating with a silver plate

In this paper, four equal-intensity laser output is described by reflective grating under normal incidence. When the duty cycle is 0.32 and the period is 3465 nm, the grating structure is analyzed by a rigorous coupled-wave method, where a good four-output beam-splitter effect can be obtained. Each reflective efficiency of the four orders is more than 20% for metasurface structure with a silver plate. The optimized results show that the grating has good performance and good application value in the field of multi-channel laser devices. In addition, the coupling mechanism of four-output reflective gratings can be well explained by the study of overlapping integral and field distribution. (paper)