Results 71 to 80 of about 5,559 (209)
Atmosphere-like turbulence generation with surface-etched phase-screens [PDF]
, 2006 We built and characterized an optical system that emulates the optical characteristics of an 8m-class telescope like the Very Large Telescope. The system contains rotating glass phase-screens to generate realistic atmosphere-like optical turbulence, as ...
Avila +14 more
core +2 more sources
Ophthalmic and Physiological Optics, Volume 45, Issue 7, Page 1581-1590, November 2025.Abstract Introduction This study evaluated the QuickSee autorefractor for measurement of the accommodative response in a cohort of children without significant ametropia, and compared the findings to those determined using the gold‐standard Shin‐Nippon device. Methods Children aged 5–7 years were recruited.
Jane M. Fulton +4 more
wiley +1 more source
Mathematics, 2021 Information on the correlations from solar Shack–Hartmann wavefront sensors is usually used for reconstruction algorithms. However, modern applications of artificial neural networks as adaptive optics reconstruction algorithms allow the use of the full ...
Francisco García Riesgo +4 more
doaj +1 more source
Constrained matched filtering for extended dynamic range and improved noise rejection for Shack-Hartmann wavefront sensing [PDF]
, 2008 We recently introduced matched filtering in the context of astronomical Shack-Hartmann wavefront sensing with elongated sodium laser beacons [Appl. Opt. 45, 6568 (2006)].
Ellerbroek, B. L., Gilles, L.
core +1 more source
Spin‐Orbit Photonics with Potato Starch Lenses
Advanced Optical Materials, Volume 13, Issue 21, July 25, 2025.Native potato starch spherulites are introduced as volumetric optical elements that modulate both dynamic and geometric phases of light. These spherulites focus light and generate optical vortices via spin‐orbit interaction, functioning as polarization‐sensitive microlenses. Their unique radial anisotropy enables applications in vortex beam generation,
Petr Bouchal +4 more
wiley +1 more source
Advanced Photonics Research, Volume 6, Issue 7, July 2025.This work presents a systematic review of atmospheric turbulence fundamentals, including theoretical formulations and adaptive optics‐based mitigation strategies. This includes an in‐depth examination of the devices, theories, and methodologies associated with traditional correction approaches.
Qinghui Liu +5 more
wiley +1 more source
A new low-cost, compact, auto-phoropter for refractive assessment in developing countries
Scientific Reports, 2017 Using a phoropter to measure the refractive error is one of the most commonly used methods by ophthalmologists and optometrists. Here, we demonstrate design and fabrication of a portable automatic phoropter with no need for patient’s feedback. The system
Babak Amirsolaimani +4 more
doaj +1 more source
Gaia in-orbit realignment. Overview and data analysis
, 2012 The ESA Gaia spacecraft has two Shack-Hartmann wavefront sensors (WFS) on its focal plane. They are required to refocus the telescope in-orbit due to launch settings and gravity release. They require bright stars to provide good signal to noise patterns.
Mora, Alcione, Vosteen, Amir
core +2 more sources
Aberration corrections for free-space optical communications in atmosphere turbulence using orbital angular momentum states [PDF]
, 2011 The effect of atmosphere turbulence on light's spatial structure compromises the information capacity of photons carrying the Orbital Angular Momentum (OAM) in free-space optical (FSO) communications.
Ding, J. +4 more
core +1 more source
Depth-resolved wavefront aberrations using a coherence-gated Shack-Hartmann wavefront sensor [PDF]
Optics Express, 2010 In the present paper we investigate the possibility of narrowing the depth range of a physical Shack - Hartmann (SH) wavefront sensor (WFS) by using coherence gating. For the coherence gating, two low coherence interferometry (LCI) methods are evaluated and proof of principle configurations demonstrated: (i) a time domain LCI method based on phase ...
Tuohy, Simon, Podoleanu, Adrian G.H.
openaire +2 more sources