1 August 2002 Diffractive lens in 8-10 to um forward-looking infrared
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Optical Engineering, 41(8), (2002). doi:10.1117/1.1487365
We realize for the first time a forward-looking IR (FLIR) system using a diffractive optical element (DOE) in its optics made of germanium in the 8- to 10-?m IR wavelength. We describe the design and the performance of the DOE optics. The IR diffractive lens made of germanium is proposed to correct the axial chromatic aberration in optics of the FLIR system. Compared with conventional optics of an FLIR system the optics using a DOE singlet instead of ZnSe achromat, we have a DOE system modulation transfer function (MTF) that is almost equal to the conventional one. The DOE singlet instead of ZnSe achromat appears to be enough to compensate for the chromatic aberration of the optical system. Using the DOE system, the numbers of lens elements, the mass, and the cost are reduced.
Jun-ichi Kudo, Hideo Wada, Toshihiro Okamura, Masako Kobayashi, Kunihiro Tanikawa, "Diffractive lens in 8-10 to um forward-looking infrared," Optical Engineering 41(8), (1 August 2002). https://doi.org/10.1117/1.1487365


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