15 December 2000 Multiband optical system using spectral filters with diffractive optical elements
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For multiband sensor applications we propose an optical system that forms different spectral images with a constant magnification and distortion over all spectral bands. Spectral filter devices are introduced for three major purposes; for determining spectral range of the bands, for correcting chromatic aberrations, and for a constant magnification and distortion. The spectral filter device has an interference band pass filter on one plane surface and a refractive-diffractive hybrid element on the other surface. The diffractive element is designed to compensate chromatic aberration in each spectral band and the aspheric refractive element has a function of setting focal length of each band to a constant value. We have designed and fabricated an optical system for two bands. The diffraction orders of the diffractive element are designed to optimize the diffraction efficiencies. Experimental results show that the difference in magnification between two bands is smaller than one pixel over full field of view. Measured MTF and images indicate that aberrations including chromatic aberration of the optical system are well compensated.
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Yasuhisa Tamagawa, Yasuhisa Tamagawa, Jiro Suzuki, Jiro Suzuki, Toru Tajime, Toru Tajime, } "Multiband optical system using spectral filters with diffractive optical elements", Proc. SPIE 4130, Infrared Technology and Applications XXVI, (15 December 2000); doi: 10.1117/12.409874; https://doi.org/10.1117/12.409874


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