• Infrared and Laser Engineering
  • Vol. 51, Issue 5, 20210512 (2022)
Yonggang Pan1, Sibao Zhang2, Zheng Liu2, Wencheng Liu2, Mian Li2, Chunjuan Zhang2, and Changxin Luo2
Author Affiliations
  • 11.Zhongshan Institute of Changchun University of Science and Techbology, Zhongshan 528437, China
  • 2Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China
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    DOI: 10.3788/IRLA20210512 Cite this Article
    Yonggang Pan, Sibao Zhang, Zheng Liu, Wencheng Liu, Mian Li, Chunjuan Zhang, Changxin Luo. Design and fabrication of polarization and phase modulated beam splitter[J]. Infrared and Laser Engineering, 2022, 51(5): 20210512 Copy Citation Text show less

    Abstract

    Polarization and phase controlled beam splitter is an indispensable optical element in free space quantum communication system. Its performance directly affects the communication quality and determines the communication error rate. Based on the theory of equivalent layer design, the special film structure of ''dielectric+metal+dielectric'' is adopted, and Ag metal material and SiO2, Al2O3, Ta2O5 dielectric material are selected to realize 45° incident angle on quartz substrate, and the average transmittance/reflectance ratio is 8.5: 91.5 in the wavelength range from 1500 nm to 1600 nm. Phase is controlled at 1530, 1540, 1550, 1560 nm. By optimizing the deposition process, the splitter film samples are prepared by electron beam evaporation with ion assisted technology. The test results show that the average transmittance/reflectance ratio is 8.53: 91.47 in the wavelength range of 1500-1600 nm under the condition of 45° incidence. The transmitted phase difference controlled within 5.02° and the reflected phase controlled with 8.05° in the range of 1530, 1540, 1550, 1560 nm, which meets the requirements of spectral energy splitting ratio and phase control of communication system. In addition, the film passed the corresponding environmental test, which meets the reliability requirements.
    Yonggang Pan, Sibao Zhang, Zheng Liu, Wencheng Liu, Mian Li, Chunjuan Zhang, Changxin Luo. Design and fabrication of polarization and phase modulated beam splitter[J]. Infrared and Laser Engineering, 2022, 51(5): 20210512
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