Short-focus and ultra-wide-angle lens design in wavefront coding

Jiyan Zhang; Yuanqing Huang; Feibing Xiong

doi:10.1117/12.2245818

19 October 2016 Short-focus and ultra-wide-angle lens design in wavefront coding

Jiyan Zhang, Yuanqing Huang, Feibing Xiong

Proceedings Volume 10154, Advanced Optical Design and Manufacturing Technology and Astronomical Telescopes and Instrumentation; 101540I (2016) https://doi.org/10.1117/12.2245818
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China

Abstract

Wavefront coding (WFC) is a hybrid technology designed to increase depth of field of conventional optics. The goal of our research is to apply this technology to the short-focus and ultra-wide-angle lens which suffers from the aberration related with large field of view (FOV) such as coma and astigmatism. WFC can also be used to compensate for other aberration which is sensitive to the FOV. Ultra-wide-angle lens has a little depth of focus because it has small F number and short-focus. We design a hybrid lens combing WFC with the ultra-wide-angle lens. The full FOV and relative aperture of the final design are up to170° and 1/1.8 respectively. The focal length is 2 mm. We adopt the cubic phase mask (CPM) in the design. The conventional design will have a wide variation of the point spread function (PSF) across the FOV and it is very sensitive with the variation of the FOV. The new design we obtain the PSF is nearly invariant over the whole FOV. But the result of the design also shows the little difference between the horizontal and vertical length of the PSF. We analyze that the CPM is non-symmetric phase mask and the FOV is so large, which will generate variation in the final image quality. For that reason, we apply a new method to avoid that happened. We try to make the rays incident on the CPM with small angle and decrease the deformation of the PSF. The experimental result shows the new method to optimize the CPM is fit for the ultra-wide-angle lens. The research above will be a helpful instruction to design the ultra-wide-angle lens with WFC.

Citation Download Citation

Jiyan Zhang, Yuanqing Huang, and Feibing Xiong "Short-focus and ultra-wide-angle lens design in wavefront coding", Proc. SPIE 10154, Advanced Optical Design and Manufacturing Technology and Astronomical Telescopes and Instrumentation, 101540I (19 October 2016); https://doi.org/10.1117/12.2245818

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