Results 31 to 40 of about 24,150 (309)
Wavefront sensing reveals optical coherence [PDF]
Nature Communications, 2014 Wavefront sensing is a set of techniques providing efficient means to ascertain the shape of an optical wavefront or its deviation from an ideal reference. Due to its wide dynamical range and high optical efficiency, the Shack-Hartmann is nowadays the most widely used of these sensors.
Stoklasa, B. +4 more
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Digging Deeper through Biological Specimens Using Adaptive Optics-Based Optical Microscopy
Photonics, 2023 Optical microscopy is a vital tool for visualizing the cellular and sub-cellular structures of biological specimens. However, due to its limited penetration depth, its biological applicability has been hindered.
Gagan Raju, Nirmal Mazumder
doaj +1 more source
Wavefront sensing using diffractive elements [PDF]
Optics Letters, 2012 In this Letter, we introduce a wavefront slope sensor based on a diffractive element. The diffractive element wavefront sensor (DEWS) produces four double overlapping copies of the incoming wavefront acting like a combination of shearing and pyramidal sensors. The DEWS allows a simple and fast slope estimate.
Pérez Cagigal, Manuel +1 more
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Wavefront measurement method based on improved light field camera
Results in Physics, 2020 The light field camera is used in the wavefront sensing field because of its simple structure, large field of view, high utilization rate of light energy, etc.
Xin Chen +7 more
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Calibration and performance evaluation of a monomorph deformable mirror
Results in Optics, 2022 To achieve diffraction-limited performance with a 50 cm solar telescope at the Udaipur solar observatory the development of a high-order adaptive optics (AO) system is currently in progress. The system includes a monomorph deformable mirror (MDM) with 85
A. Raja Bayanna +3 more
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High-contrast imager for Complex Aperture Telescopes (HiCAT): 1. Testbed design [PDF]
, 2013 Searching for nearby habitable worlds with direct imaging and spectroscopy will require a telescope large enough to provide angular resolution and sensitivity to planets around a significant sample of stars.
Carlotti, Alexis +13 more
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Fast & Furious focal-plane wavefront sensing [PDF]
Applied Optics, 2014 We present two complementary algorithms suitable for using focal-plane measurements to control a wavefront corrector with an extremely high spatial resolution. The algorithms use linear approximations to iteratively minimize the aberrations seen by the focal-plane camera.
Korkiakoski, V.A. (author) +5 more
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Beam wavefront retrieval by convoluted spatial spectral benchmark
Matter and Radiation at Extremes, 2021 We propose a method for retrieving a beam wavefront from its near-field intensity distribution after a 4f system by simply inserting a benchmark at the Fourier plane.
Xuewei Deng +5 more
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Wavefront sensing with a thin diffuser [PDF]
Optics Letters, 2017 We propose and implement a broadband, compact, and low-cost wavefront sensing scheme by simply placing a thin diffuser in the close vicinity of a camera. The local wavefront gradient is determined from the local translation of the speckle pattern. The translation vector map is computed thanks to a fast diffeomorphic image registration algorithm and ...
Berto, Pascal +2 more
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Transmission wavefront shearing interferometry for photoelastic materials [PDF]
, 2009 A general analysis and experimental validation of transmission wavefront shearing interferometry for photoelastic materials are presented. These interferometers applied to optically isotropic materials produce a single interference pattern related to one
Bhattacharya, Kaushik +2 more
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