Results 141 to 150 of about 239,453 (286)
High Power Laser Science and EngineeringIn laser systems requiring a flat-top distribution of beam intensity, beam smoothing is a critical technology for enhancing laser energy deposition onto the focal spot.
Yamin Zheng +9 more
doaj +1 more source
Digital Mirror Device Application in Reduction of Wave-front Phase Errors
Sensors, 2009 In order to correct the image distortion created by the mixing/shear layer, creative and effectual correction methods are necessary. First, a method combining adaptive optics (AO) correction with a digital micro-mirror device (DMD) is presented.
Shuxue Wang, Yaping Zhang, Yan Liu
doaj +1 more source
Recovering pyramid WS gain in non-common path aberration correction mode via deformable lens
, 2017 It is by now well known that pyramid based wavefront sensors, once in closed loop, have the capability to improve more and more the gain as the reference natural star image size is getting smaller on the pyramid pin. Especially in extreme adaptive optics
Bergomi, M. +7 more
core +1 more source
Extremely asymmetric ectasia: Tomographically unilateral keratoconus
Acta Ophthalmologica, EarlyView.Abstract Purpose To investigate the characteristics of apparently stable forms of tomographically unilateral keratoconus (KC). Methods In this retrospective case–control study, strict unilaterality criteria were applied to select tomographically unilateral cases with ≥3 years of follow‐up.
Hasan Shabani +6 more
wiley +1 more source
Presbyopia Correction in Lens Replacement Surgery: A Review
Clinical &Experimental Ophthalmology, EarlyView.ABSTRACT Presbyopia affects approximately 1.8 billion individuals globally, posing significant challenges as life expectancy and near‐vision demands, particularly with mobile phone use, grow. Addressing presbyopia during lens replacement surgery has become a key focus for cataract surgeons, aiming to reduce dependence on corrective eyewear. This review
Benjamin Stern, Damien Gatinel
wiley +1 more source
Research Progress of Deformable Mirror and Its Control Algorithm
Guangtongxin yanjiu【Objective】Deformable Mirror(DM) is a key device in adaptive optics system for wavefront correction, and its performance directly determines the wavefront correction capability of the system.
LIANG Jingyuan +7 more
doaj
Numerical Simulation of Performance Improvement of Coherent LiDAR Based on SPGD Algorithm
IEEE Photonics JournalAtmospheric turbulence can significantly impact the effectiveness of light detection and ranging (LiDAR) in long-range detection. A technique for wavefront correction, which is based on the stochastic parallel gradient descent (SPGD) optimization ...
Zhiyong Wu +7 more
doaj +1 more source
Real‐Time Rendering Framework for Holography
Computer Graphics Forum, EarlyView.Abstract With the advent of holographic near‐eye displays, the need for rendering algorithms that output holograms instead of color images emerged. These holograms usually encode phase maps that alter the phase of coherent light sources such that images result from diffraction effects.
Sascha Fricke +3 more
wiley +1 more source
Wavefront retrieval through random pupil plane phase probes: Gerchberg-Saxton approach [PDF]
arXiv, 2017 A pupil plane wavefront reconstruction procedure is proposed based on analysis of a sequence of focal plane images corresponding to a sequence of random pupil plane phase probes. The developed method provides the unique nontrivial solution of wavefront retrieval problem and shows global convergence to this solution demonstrated using a Gerchberg-Saxton
arxiv
Astigmatism and defocus wavefront correction via Zernike modes produced with fluidic lenses [PDF]
, 2009 Randall Marks +4 more
openalex +1 more source