Potential benefits of free-form optics in on-axis imaging applications with high aspect ratio

Duerr, Fabian; Meuret, Youri; Thienpont, Hugo

doi:10.1364/oe.21.031072

Cited by 59 publications

(20 citation statements)

References 20 publications

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“…The position of the pupil plays an important role in correcting off-axis aberrations, especially coma. 22 In most existed direct design cases, 15,23,24 the entrance pupil is also the first optical surface of the system, neglecting the function of an independent pupil in diminishing optical aberrations.…”

Section: Initial Degrees Of Freedom and Prerequisites Formentioning

confidence: 99%

Direct design approach to calculate a two-surface lens with an entrance pupil for application in wide field-of-view imaging

2015

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Abstract. In this work, a multifields optical design method aiming to calculate two high-order aspheric lens profiles with an embedded entrance pupil is proposed. This direct design algorithm is capable of partially coupling more than three ray bundles that enter the same pupil with only two surfaces. Both infinite and finite conjugate objectives can be designed with this approach. Additional constraints such as surface continuity and smoothness are taken into account to calculate smooth and accurate surface contours described by point clouds. The calculated points are then fitted with rotationally symmetric functions commonly used in optical design tools. A presented subaperture sampling strategy that introduces a weighting function for different fields allows for a very well-balanced imaging performance over a wide field of view (FOV). As an example, a AE45 deg f ∕7.5 wideangle objective is designed and analyzed to demonstrate the potential of this design method. It provides an excellent starting point for further optimization of the surfaces' coefficients and initial design parameters, resulting in a very good and well-balanced imaging performance over the entire FOV. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Initial Degrees Of Freedom and Prerequisites Formentioning

confidence: 99%

Direct design approach to calculate a two-surface lens with an entrance pupil for application in wide field-of-view imaging

2015

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“…Figure 11. RMS spot diameter for the contour plots of the SMS free-form lens with high aspect ratio before and after the optimization 13 Figure 12. Comparison of the optimized rotational symmetric lens and the optimized free-form SMS3D lens.…”

Section: Application To Optimizationmentioning

confidence: 99%

Conditions for perfect focusing multiple point sources with the SMS design method

Benı́tez

Miñano²,

Nikolić

et al. 2014

SPIE Proceedings

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“…However, freeform lenses are considered to possess some advantages to match the rectangular FOV of the detectors. It was demonstrated that freeform optics could help provide solutions with a distinctly better overall imaging performance for on-axis imaging applications with high aspect ratios [26]. Although freeform lenses are used in rotationally symmetric optical systems, freeform surfaces can correct high-order aberrations in the x-and y-directions more effectively than high-order aspheric surfaces.…”

Section: Introductionmentioning

confidence: 99%

Design and Tests of a High-Performance Long-Wave Infrared Refractive Thermal Imager: Freeform Lens in Coaxial System

Chen

Jin

et al. 2017

Applied Sciences

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Abstract:In this paper, we used a freeform lens in a long-wave, un-cooled, refractive infrared (IR) thermal imager and present the design strategy and test results. This optical system is composed of only one freeform lens and several spheres. It can correct the distortion issue inherent to wide field-of-view systems more effectively, and achieve a better thermal imaging performance simultaneously compared to traditional aspheric optical lenses. Such a design model can alleviate the calculation load and cater for the demand of the ultra-precision turning on single crystal germanium. It satisfies the design idea of freeform surfaces with machining feasibility. The refractive freeform IR imager can be realized from the theoretical design to the engineering applications. The research contents of this paper are helpful for the further application of the freeform lens to a more complex cooled infrared refractive thermal imager.

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Potential benefits of free-form optics in on-axis imaging applications with high aspect ratio

Cited by 59 publications

References 20 publications

Direct design approach to calculate a two-surface lens with an entrance pupil for application in wide field-of-view imaging

Direct design approach to calculate a two-surface lens with an entrance pupil for application in wide field-of-view imaging

Conditions for perfect focusing multiple point sources with the SMS design method

Design and Tests of a High-Performance Long-Wave Infrared Refractive Thermal Imager: Freeform Lens in Coaxial System

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