Reconfigurable Shack-Hartmann sensor without moving elements

Martínez‐Cuenca, Raúl; Durán, Vicente; Climent, Vicent; Tajahuerce, Enrique; Bará, Salvador; Ares, Jorge; Arines, Justo; Martı́nez-Corral, Manuel; Láncis, Jesús

doi:10.1364/dh.2010.dtub4

Cited by 3 publications

(5 citation statements)

References 7 publications

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“…]. (33) We can see that this this result is similar to that obtained for the singleaperture one, but now with two integrals. By solving both integrals, Δ𝑥 can be expressed as:…”

Section: Complex Amplitude Retrieval Of An Objectsupporting

confidence: 83%

“…This problem can be circumvented (without sacrificing sensitivity) by a number of techniques that track the real spot location or infer it by using computational techniques [29]. Instead of trying to expand the dynamic range of a sensor by increasing its hardware and/or software complexity, an alternative approach is to implement a reconfigurable (adaptive) SH sensor that includes an array of diffractive lenslets programmed onto a spatial light modulator [28,33]. The lenslet characteristics can be then chosen to match the requirements of a specific application optimally, albeit the tradeoff between sensitivity and dynamic range still remains.…”

Section: Operation Principlementioning

confidence: 99%

“…However, the number of lenslets, their focal length, and their diameter limit the spatial resolution, dynamic range, and sensibility of SH wavefront sensing. Although multiple solutions have been proposed to manage the several tradeoffs between the above magnitudes [28][29][30][31][32][33][34][35][36], manufacturing processes still place a boundary on the size and curvature of available lenslets, constraining the attainable spatial resolution of commercial SH sensors. Quadriwave lateral shearing interferometry [37], also known as a modified Hartmann mask technique, makes it possible to increase the SH spatial resolution by a factor four [38].…”

Section: Introductionmentioning

confidence: 99%

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Phase imaging by spatial wavefront sampling

Soldevila¹,

Durán²,

Clemente³

et al. 2018

Optica

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Phase imaging techniques extract the optical path-length information of a scene, whereas wavefront sensors provide the shape of an optical wavefront. Since these two applications have different technical requirements, they have developed their own specific technology. Here we show how to perform phase imaging combining wavefront sampling using a reconfigurable spatial light modulator with a beam position detector. The result is a timemultiplexed detection scheme, capable of being shortened considerably by compressive sensing. This robust reference-less method does not require the phase unwrapping algorithms demanded by conventional interferometry, and its lenslet-free nature removes tradeoffs usually found in Shack-Hartmann sensors.

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“…]. (33) We can see that this this result is similar to that obtained for the singleaperture one, but now with two integrals. By solving both integrals, Δ𝑥 can be expressed as:…”

Section: Complex Amplitude Retrieval Of An Objectsupporting

confidence: 83%

Section: Operation Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Phase imaging by spatial wavefront sampling

Soldevila¹,

Durán²,

Clemente³

et al. 2018

Optica

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show abstract

“…When voltage is applied to the lens, the curvature of the surface changes, thus modifying the spherical power of the lens. These lenses have been applied to different uses: to change the focal of the microlens array in a Hartmann-Shack system [5] and as an adaptive optics actuator in different applications such as optical coherence microscopy [6].…”

Section: Introductionmentioning

confidence: 99%

Spherical refractive correction with an electro-optical liquid lens in a double-pass system

Sanabria

Díaz-Doutón

Aldaba

et al. 2013

J. Eur. Opt. Soc.-Rapid Publ.

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In this study we show a novel double-pass configuration to correct the spherical refractive error by means of an electro-optical liquid lens. The proposed method enables spherical correction in the-12 D to +7 D range without movable parts using an electro-optical liquid lens. We have measured the optical performance of the spherical corrector in terms of power, pupil size and optical quality verifying that it fits the requirements to be applied to a double-pass system. We have also evaluated the performance of the proposed method in patients by comparison with a conventional double-pass system using a Badal optometer.

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“…3.12.a) [97]. A manner of tackling this problem is by changing the focal spot of the lenslet array, but there is a tradeoff between sensitivity in the phase measurement and dynamic range that cannot be physically bypassed (although there exist diverse computational methods that try to solve it [97][98][99][100]). In order to solve these problems, one simple approach could be to just block the light from all lenslets except one (see Fig.…”

Section: Phase Imaging Using a Single-pixel Cameramentioning

confidence: 99%

Multidimensional Computational Imaging using Single-pixel Detectors

Torres¹

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Castellón de la Plana, noviembre de 2018 ii "[...] L'amour des Lettres, qui est un mérite chez nos voisins, n'est encore à la vérité qu'une mode parmi nous, & ne sera peut-être jamais autre chose; mais quelque dangereuse que soit cette mode, qui pour un Mécene éclairé produit cent Amateurs ignorans & orgueilleux, peutêtre lui sommes-nous redevables de n'être pas encore tombés dans la barbarie où une foule de circonstances tendent à nous précipiter.On peut regarder comme une des principales, cet amour du faux bel esprit, qui protege l'ignorance, qui s'en fait honneur, & qui la répandra universellement tôt ou tard. Elle sera le fruit & le terme du mauvais goût; j'ajoûte qu'elle en sera le remede. Car tout a des révolutions reglées, & l'obscurité se terminera par un nouveau siecle de lumiere. Nous serons plus frappés du grand jour, après avoir été quelque tems dans les ténebres. Elles seront comme une espece d'anarchie très-funeste par elle-même, mais quelquefois utile par ses suites. Gardonsnous pourtant de souhaiter une révolution si redoutable; la barbarie dure des siecles, il semble que ce soit notre élément; la raison & le bon goût ne font que passer. [...]" "[...] El amor a las letras, que es un mérito entre nuestros vecinos, entre nosotros no es aún más que una moda, y acaso no sea nunca otra cosa; pero por muy peligrosa que sea esta moda, que, por un Mecenas inteligente produce cien aficionados ignorantes y orgullosos, quizá le debemos el no haber caído todavía en la barbarie a que tienden a precipitarnos multitud de circunstancias.Se puede considerar como una de las principales ese amor al falso ingenio que protege a la ignorancia, que presume de él y que la difundirá universalmente más tarde o más temprano. Será el fruto y el término del mal gusto; añado que será su remedio. Pues todo tiene revoluciones previstas, y la oscuridad terminará en un nuevo siglo de luz. La claridad nos impresionará más después de haber permanecido algún tiempo en las tinieblas. Será como una especie de anarquía muy funesta en sí, pero útil en sus consecuencias. Librémonos, sin embargo, de desear una revolución tan temible; la barbarie dura siglos, y parece que es nuestro elemento; la razón y el buen gusto son pasajeros. [...]" Jean le Rond d'Alembert. Prólogo a la Encyclopédie, ou Dictionnaire raisonné des sciences, des arts et des métiers. (1751-1772). iii UNIVERSTITAT JAUME I Abstract Escola Superior de Tecnologia i Ciències Experimentals, ESTCE Physics Doctor of Philosophy Multidimensional Computational Imaging using Single-pixel Detectors by Fernando Soldevila vi que programa; al exterminador de mosquitos; a los chili; al que se hace ecografías de los riñones pasando por los testículos; a la que se duerme en el coche; al salto patentado; a los que se bañan; al triple postre; a los que no les salen las prácticas; a Piero; a los ordenadores en el baño y a todos los que me dejo en el tintero debido a mi memoria lamentable. A todos vosotros, gracias. vii

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Reconfigurable Shack-Hartmann sensor without moving elements

Cited by 3 publications

References 7 publications

Phase imaging by spatial wavefront sampling

Phase imaging by spatial wavefront sampling

Spherical refractive correction with an electro-optical liquid lens in a double-pass system

Multidimensional Computational Imaging using Single-pixel Detectors

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