31 May 2005 Infrared imaging lens with extended depth of focus
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An infrared imaging lens that produces beams with long focal depth whilst preserving the entire aperture for full light capturing and high transverse resolution is presented. It is a diffractive optical element that generates a long range of pseudo-non-diffractive rays. The design technique is based on the conjugate-gradient algorithm. The surface relief pattern was generated on a thick film photoresist and then the pattern was transferred to germanium substrate. Preliminary experimental results demonstrated four times improvement in depth of focus at 10.6 μm wavelength.
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Zhiqiang Liu, Zhiqiang Liu, Angel Flores, Angel Flores, Michael R. Wang, Michael R. Wang, Jame J. Yang, Jame J. Yang, } "Infrared imaging lens with extended depth of focus", Proc. SPIE 5783, Infrared Technology and Applications XXXI, (31 May 2005); doi: 10.1117/12.602990; https://doi.org/10.1117/12.602990

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