Analysis of restriction factors of widening diffraction bandwidth of multilayer dielectric grating

• Published in: Chinese physics B 2010-10, Vol.19 (10), p.265-272
• Main Author: Wang Jian-Peng Jin Yun-Xia Ma Jian-Yong Shao Jian-Da Fan Zheng-Xiu
• Format: Article
• Language: English
• Subjects: 介质光栅; 多层介质; 宽带宽; 导模共振; 脉冲压缩; 衍射光栅; 衍射光谱; 高反射镜
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/19/10/104201

In order to design a multilayer dielectric grating with wide-bandwidth diffraction spectrum, the restriction factors of both the reflection bandwidth of multilayer dielectric high-reflectivity mirror and the guided-mode resonance phe- nomenon are studied in detail. The reflection characteristics of high-reflectivity mirror in zeroth and -lst transmitted diffraction orders are quantitatively evaluated. It is found that the reflection bandwidth of high-reflectivity mirror in -lst transmitted diffraction order, which determines the final diffraction bandwidth of multilayer dielectric grating, is evidently compressed. Furthermore, it is demonstrated that the reducing of grating period is an effective approach to the elimination of guided mode resonance over a required broad band range both spectrally and angularly. In addition, the expressions for calculating the maximum period ensuring no guided mode resonance in the required bandwidth are derived. Finally, two high-efficiency pulse-compression gratings with broad-band are presented.