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8 November 2018 Sagnac spectral imaging resolved with two high-density gratings
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Spectrum plays an essential role in spectral imaging technology. To obtain the spectral information of image, two high - density diffraction gratings which substitute the prism are introduced in the Sagnac loop to form the polarization Sagnac interferometer (PSI). Usually, it’s difficult for prism to achieve wider angle of spectral line and higher resolution, the presented Sagnac loop with high-density gratings has advantages of wide spectral and high resolution. Meanwhile, the dispersion generated by grating is more uniformed than the prism. The two parallel beams exit from the Sagnac loop and the pass through the linear polarizer and finally polymerized on the focal plane array (FPA) by an imaging lens. This compact Sagnac loop with two high-density diffraction gratings is a new way to obtain the spectral-resolved image, which should be interesting for practical applications.
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Yongfang Xie, Changhe Zhou, Wei Jia, Jin Wang, and Changcheng Xiang "Sagnac spectral imaging resolved with two high-density gratings", Proc. SPIE 10818, Holography, Diffractive Optics, and Applications VIII, 1081817 (8 November 2018);


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