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) Output-plane intensity distributions of the designed 32-level DOE in Fig. 5(a), for the 17 incident wavelengths within the waveband [450 650] nm with an interval of 12.5 nm. The three intensity peaks correspond to the three designed wavelengths of 0.45, 0.55, and , respectively.