Simple and universal method in designs of high-efficiency diffractive optical elements for spectrum separation and beam concentration
Xu Wen-Qi1, Lin Dong-Feng2, Xu Xin2, Ye Jia-Sheng1, †, Wang Xin-Ke1, Feng Sheng-Fei1, Sun Wen-Feng1, Han Peng1, Zhang Yan1, Meng Qing-Bo2, Yang Guo-Zhen2
       

(color online) A schematic diagram of the diffractive optical element (DOE) for implementing the spectrum separation and beam concentration (SSBC) functions.