Improving the imaging quality of a dispersion-compensated polarization Sagnac interferometer by using a set of parallel plates

Shiqun Jin; Yi Zhang; Qiaoqin Chen; Jinyu Xing; Guo Xia; Mingyong Hu

doi:10.1117/12.2557972

17 April 2020 Improving the imaging quality of a dispersion-compensated polarization Sagnac interferometer by using a set of parallel plates

Shiqun Jin, Yi Zhang, Qiaoqin Chen, Jinyu Xing, Guo Xia, Mingyong Hu

Author Affiliations +

Proceedings Volume 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications; 114550C (2020) https://doi.org/10.1117/12.2557972
Event: Sixth Symposium on Novel Photoelectronic Detection Technology and Application, 2019, Beijing, China

Abstract

The output beams of a dispersion-compensated polarization Sagnac interferometer (DCPSI) contains not only the ±1 order but the 0 and other order beams, and most of them are not parallel to 0 order. This condition reduces the contrast of interference fringes generated in a focal plane array (FPA), indicating that the quality of the reconstructed polarization images is poor. Thus, an effective means for improving the imaging quality is by reducing the influence of other orders. This study introduces a set of parallel plates before the imaging lens to isolate most beams apart from ±1 and 0 order beams. This method can isolate most of the useless interference fringes because of multi-level diffraction. Simulation results show most of the unwanted interference fringes are isolated. Experimental results show that most of the useless multi-level diffracted light is isolated, and the interference fringes generated on the FPA are not affected by multi-order diffracted diffracted light apart from ±1 and 0 order beams. Therefore, this optical structure can reduce the influence of other orders and this effective method can be used to improve the imaging quality of DCPSI. Moreover, this method provides important reference for reducing the influence of multistage diffraction grating on the imaging quality of other interferometers that contain grating.

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Shiqun Jin, Yi Zhang, Qiaoqin Chen, Jinyu Xing, Guo Xia, and Mingyong Hu "Improving the imaging quality of a dispersion-compensated polarization Sagnac interferometer by using a set of parallel plates", Proc. SPIE 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications, 114550C (17 April 2020); https://doi.org/10.1117/12.2557972

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KEYWORDS

Diffraction gratings

Diffraction

Staring arrays

Polarization

Sagnac interferometers

Prisms

Analytical research

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