9 May 2012 Catadioptric optics for high-resolution terahertz imager
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INO has developed infrared camera systems with microscanning capabilities in order to increase image resolution. It has been shown in previous works that the image quality may be improved even if the pixel pitch is smaller than the point spread function. This paper introduces a catadioptric optics system with fully integrated microscan for improved resolution in the THz band. The design, inspired by the INO's HRXCAM infrared camera core and adapted for terahertz wavelengths, includes two mirrors and one refractive element. It has a 11.9 degree full field of view and an effective F-number of 1.07 over a wide spectral range, from 100 μm to 1.5 mm wavelength. This diffraction limited optics is used to provide video rate high quality THz images. A THz camera, with 160 x 120 pixel and 52 μm pitch detector, is combined with the microscan objective to provide a 320 x 240 pixel image with a 26 μm sampling step. Preliminary imaging results using a THz illumination source at 118 μm wavelength are presented. A comparison between standard and microscanned images is also presented.
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Nathalie Blanchard, Nathalie Blanchard, Linda Marchese, Linda Marchese, Anne Martel, Anne Martel, Marc Terroux, Marc Terroux, Éric Savard, Éric Savard, Claude Chevalier, Claude Chevalier, Luc Mercier, Luc Mercier, Lucie Gagnon, Lucie Gagnon, Julie Lambert, Julie Lambert, Martin Bolduc, Martin Bolduc, Alain Bergeron, Alain Bergeron, } "Catadioptric optics for high-resolution terahertz imager", Proc. SPIE 8363, Terahertz Physics, Devices, and Systems VI: Advanced Applications in Industry and Defense, 83630B (9 May 2012); doi: 10.1117/12.918583; https://doi.org/10.1117/12.918583

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