Demonstration of polarization-independent broadband multilayer gratings

Tao He; Jinlong Zhang; Hongfei Jiao; Zhanshan Wang; Xinbin Cheng

doi:10.1117/12.2585380

4 December 2020 Demonstration of polarization-independent broadband multilayer gratings

Tao He, Jinlong Zhang, Hongfei Jiao, Zhanshan Wang, Xinbin Cheng

Proceedings Volume 11617, International Conference on Optoelectronic and Microelectronic Technology and Application; 116172T (2020) https://doi.org/10.1117/12.2585380
Event: International Conference on Optoelectronic and Microelectronic Technology and Application, 2020, Nanjing, China

Abstract

Multilayer dielectric gratings (MDGs) have been widely used in spectral beam combining, chirped pulse amplification, and external cavity diode lasers systems. However, the one-dimensional MDGs suffer from the polarization-sensitive properties due to the modulation in only one direction. Two-dimensional (2D) MDGs have more flexible control ability to realize polarization-independent properties but are rarely reported. Here, we demonstrate the realization of polarizationindependent broadband MDGs via 2D grating array. The 2D Si:H MDG exhibits more than 97% non-polarized diffraction efficiency over 90 nm. Further, the influence of the refractive index on high-efficiency bandwidth of the MDGs was investigated via a comparative study using Si:H and TiO₂, materials with a large difference in refractive indexes. The high-efficiency bandwidth of Si:H MDGs is near 1.4 times the breadth of TiO₂ MDGs. Our results provide a new platform and deeper understanding to realize polarization-independent broadband MDGs.

Citation Download Citation

Tao He, Jinlong Zhang, Hongfei Jiao, Zhanshan Wang, and Xinbin Cheng "Demonstration of polarization-independent broadband multilayer gratings", Proc. SPIE 11617, International Conference on Optoelectronic and Microelectronic Technology and Application, 116172T (4 December 2020); https://doi.org/10.1117/12.2585380

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