Diffractive infrared lens with extended depth of focus

Liu, Zhiqiang; Flores, Angel; Wang, Michael R.; Yang, Jianwen

doi:10.1117/1.2430506

Cited by 25 publications

(8 citation statements)

References 16 publications

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“…Optimizing the parameters of optical elements and point spread function engineering are well-known techniques in the computational optics and visual computing communities. Optimized optical system parameters have proven useful for extended depth of field [Dowski and Cathey 1995;Flores et al 2004;Liu 2007], motion [Raskar et al 2006] and defocus ] deblurring, 4D light field imaging [Marwah et al 2013], super-resolved localization microscopy [Pavani et al 2009;Shechtman et al 2014], and full-color imaging with diffractive optics ]. Optimization of optical models has also been proposed for multi-element systems to either arrive at novel arrangements of off-the-shelf lenses [Sun et al 2015] or to allow precise calibration of models [Shih et al 2012] of these systems.…”

Section: Related Workmentioning

confidence: 99%

“…While compound systems are well-known for their ability to correct chromatic aberrations, they increase the device footprint. Hybrid elements for achromatic EDOF have been proposed [Flores et al 2004;Liu 2007] as a compromise that reduces chromatic aberrations by combining a single diffractive and a single refractive optical element, but add complexity to the manufacturing process.…”

Section: Related Workmentioning

confidence: 99%

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End-to-end optimization of optics and image processing for achromatic extended depth of field and super-resolution imaging

et al. 2018

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Fig. 1. One of the applications of the proposed end-to-end computational camera design paradigm is achromatic extended depth of field. When capturing an image with a regular singlet lens (top left), out-of-focus regions are blurry and chromatic aberrations further degrade the image quality. With our framework, we optimize the profile of a refractive optical element that achieves both depth and chromatic invariance. This element is fabricated using diamond turning (right) or using photolithography. After processing an image recorded with this optical element using a simple Wiener deconvolution, we obtain an all-in-focus image with little chromatic aberrations (top center). Point spread functions for both the regular lens and the optimized optical element are shown in the bottom. In this paper, we explore several applications that demonstrate the efficacy of our novel approach to domain-specific computational camera design.

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Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

End-to-end optimization of optics and image processing for achromatic extended depth of field and super-resolution imaging

et al. 2018

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“…For elements with spherical aberrations and multifocal lenses smaller apertures lead to decrease of the focal segment length. On the last map we can see that the lens with angular aberration is not sensible for changes of the aperture diameter, contrary to the elements with symmetry of revolution designed for the purpose of increasing the focal depth [6][7][8][9] …”

Section: Results Of Simulationsmentioning

confidence: 99%

Presbyopia compensation with a light sword optical element

Gómez¹,

Bará²,

Garcia³

et al. 2008

16th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics

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This paper presents numerical analysis of imaging quality of a refractive light sword optical element (LSOE). For comparison other optical imaging elements with extended focal depth, such as the bifocal lens, the trifocal lens, the forward axicon and the backward axicon, were also checked. The parameters of all elements were assumed according to the human eye parameters in order to check possibilities of presbyopia compensation. Obtained results allow to state that the LSOE is a promising solution for compensation of insufficient human eye accommodation.

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“…High depth of focus (DoF) systems have a wide application area covering optical data storage, endoscopic optical coherence tomography, microscopy, video imaging, ophthalmology or optical microlithography. There exist many different designs to generate an elongated DoF without changing the numerical aperture (NA) [1][2][3][4][5]. The principle of pupil filters is to modulate the amplitude or phase of the incoming light in the lens plane (pupil plane) to engineer the focusing properties of the lens.…”

Section: Introductionmentioning

confidence: 99%

Wavefront Modulation for an Elongated Depth of Focus with a Homogeneous Point Spread Function

Iwaniuk¹,

Rastogi²,

Hack³

2010

AIP Conference Proceedings

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We present a pure phase pupil filter design for an extended depth of focus (DoF) with a homogeneous transversal behavior. State of the ort solutions base on complex (amplitude and phase) modulation or on diffractive phase filters, which have either low conversion efficiency due to the blocking of light or very complex structures. Our design is a quartic multiplex phase-only function with good performance and simple annular structure. Numerical simulation based on the Kirchhoff diffraction integral and experiments performed with a modulation transfer function measurement system combined with a spatial phase modulation liquid crystal device show in agreement a three times enlarged focal depth with homogeneous transversal spot size. Further simulations suggest that the depth of focus can be extended up to a factor 12. However, when using monochromatic polarized light interference effects disturb the uniform intensity along the focal depth..

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Diffractive infrared lens with extended depth of focus

Cited by 25 publications

References 16 publications

End-to-end optimization of optics and image processing for achromatic extended depth of field and super-resolution imaging

End-to-end optimization of optics and image processing for achromatic extended depth of field and super-resolution imaging

Presbyopia compensation with a light sword optical element

Wavefront Modulation for an Elongated Depth of Focus with a Homogeneous Point Spread Function

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