Integrated diffractive shearing interferometry for adaptive wavefront sensing

Karp, Jason H.; Chan, Theodore; Ford, Joseph E.

doi:10.1364/ao.47.006666

Cited by 11 publications

(4 citation statements)

References 25 publications

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“…(15)(16)(17). This explanation shows that high contrast grating images are tightly related to the Talbot condition.…”

Section: Talbot Effect and Generalized Grating Imagingmentioning

confidence: 79%

“…These effects have been used in many applications, which include periodic pattern projection [12][13][14], optical shearing interferometry [15][16][17][18][19], array illuminators [20,21], X-ray interferometry [22][23][24], and matter-wave interferometry [25]. These applications will become more important because fabrication techniques of micro-elements including gratings are making much progress.…”

Section: Introductionmentioning

confidence: 99%

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Relaxation of the Talbot condition in generalized grating imaging

Iwata¹,

Satoh

Moriwaki

2012

Appl. Opt.

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We can form a grating image with two gratings having different pitches with an extended light source. It is called generalized grating imaging or the Talbot-Lau effect. When we want to obtain high contrast image with pure absorption gratings or pure phase gratings, the separation between the two gratings is restricted. This corresponds to the Talbot condition. In this paper, we propose to use a combination of absorption grating and phase grating to relax the separation restriction. The theory of generalized grating imaging is applied to the system with this kind of grating. Simulations are performed for calculating contrast variation and show that the proposed system practically relaxes the Talbot condition. An experiment verifies the result of the simulation.

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“…(15)(16)(17). This explanation shows that high contrast grating images are tightly related to the Talbot condition.…”

Section: Talbot Effect and Generalized Grating Imagingmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Relaxation of the Talbot condition in generalized grating imaging

Iwata¹,

Satoh

Moriwaki

2012

Appl. Opt.

View full text Add to dashboard Cite

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“…Thus, two or more measurements must be made separately along two orthogonal directions of shear. This may be accomplished sequentially by using prisms mounted on translation or rotator stages or, better, simultaneously using DOEs or SLMs 65 …”

Section: Innovative Methods For Sensing the Wave Aberrations Of Humanmentioning

confidence: 99%

“…This may be accomplished sequentially by using prisms mounted on translation or rotator stages or, better, simultaneously using DOEs or SLMs. 65 More recently, a new family of shearing interferometry has been developed, based on interference of more than one replica of an analysed wavefront with different directions of shear. These techniques are commonly called 'multiple shearing interferometry' (MSI).…”

Section: Innovative Methods For Sensing the Wave Aberrations Of Humanmentioning

confidence: 99%

New methods and techniques for sensing the wave aberrations of human eyes

Lombardo

2009

Clinical and Experimental Optometry

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During the past decade, there has been a remarkable expansion of the application of wavefront-related technologies to the human eye. The ability to measure the wavefront aberrations (WA) of an individual eye has greatly improved our understanding on the optical properties of the human eye. The development of wavefront sensors has further generated an intensive effort to revise methods to correct vision. Wavefront sensors have offered the promise of a new generation of visual correction methods that can correct high order aberrations beyond defocus and astigmatism, that is, the wavefront-guided excimer laser platforms and adaptive optics, thus improving visual performance or fundus imaging at unprecedented spatial resolution. On the other hand, current wavefront technologies suffer from some inaccuracies that may limit a wider expansion in the clinical environment. Several innovative approaches have been developed to overcome the limits of standard wavefront sensing techniques. Curvature sensing, pyramid sensing and interferometry currently represent the most reliable methods to revise and improve the measurement and reconstruction of the WA of human eyes. This review describes advantages and disadvantages of current wavefront sensing technologies and provides recent knowledge on innovative methods for sensing the WA of human eyes. In the near future, we expect to benefit from these new wavefront sensor elements, including their application in the personalised correction of optical aberrations and adaptive optics imaging of the eye. Key words: curvature sensor, dynamic range, pyramid sensor, Shack-Hartmann sensor, shearing interferometry Optical aberrations of the eye include loworder and high-order aberrations. These aberrations degrade visual performance and blur the retinal image. The lower order aberrations, defocus and astigmatism, are widely known and corrected routinely in clinical practice. The presence of high-order ocular aberrations, beyond defocus and astigmatism, has been known by researchers since the 19th Century but only in the 1990s were wavefront sensors developed to allow routine estimation of these ocular aberrations.

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