Exact and numerical design of non-polarizing edge filters
Yiqin Ji1;2, Deying Chen1, Huasong Liu2;3, Zhanshan Wang3, Wei Hong2, and Dandan Liu2
Chinese Optics Letters , Vol.08 , Issue s1 , PP.25-28(2010)

Keywords(OCIS Code)
310.5696; 310.4165; 310.5448

Abstract
Multilayer dielectric thin films have polarization effects at non-normal incidence. In this letter, specifications include s- and p-polarization transmittance (Ts,(p) ≥ 95% at 790—808 nm), s- and p-polarization reflectance (Rs,(p) ≥ 95% at 814—860 nm), angle of incidence (AOI) = 45°, air as incident medium, and BK7 glass as substrate. Based on the two chosen materials (Ta2O5 and SiO2), non-polarized edge filters are carried out using the design methods of the detuned multiple half-wave filters (exact design) and the needle optimization (numerical design). Exact design has a total of 112 layers and 12 cavities; optical thickness is 126 quartwaves at 860 nm. Numerical design has a total of 107 layers and 8 cavities; optical thickness is 91 quartwaves at 850 nm. Hence, the numerical design has less layers and thickness, thus meeting the same specifications of the exact design.

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References

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