Results 21 to 30 of about 48,622 (298)

Reinforcement Learning Environment for Wavefront Sensorless Adaptive Optics in Single-Mode Fiber Coupled Optical Satellite Communications Downlinks

Photonics, 2023
Optical satellite communications (OSC) downlinks can support much higher bandwidths than radio-frequency channels. However, atmospheric turbulence degrades the optical beam wavefront, leading to reduced data transfer rates.
Payam Parvizi, Runnan Zou, Colin Bellinger, Ross Cheriton, Davide Spinello   +4 more
doaj   +1 more source

Advanced Wavefront Control Techniques [PDF]

, 2001
Programs at LLNL that involve large laser systems--ranging from the National Ignition Facility to new tactical laser weapons--depend on the maintenance of laser beam quality through precise control of the optical wavefront. This can be accomplished using adaptive optics, which compensate for time-varying aberrations that are often caused by heating in ...
Olivier, S. S., Brase, J. M., Avicola, K., Thompson, C. A., Kartz, M. W., Winters, S., Hartley, R., Wihelmsen, J., Dowla, F. V., Carrano, C. J., Bauman, B. J., Pennington, D. M., Lande, D., Sawvel, R. M., Silva, D. A., Cooke, J. B., Brown, C. G.   +16 more
openaire   +2 more sources

Compensation of phase nonlinearity of liquid crystal spatial light modulator for high-resolution wavefront correction [PDF]

Journal of the European Optical Society-Rapid Publications, 2015
The ability of phase modulation enables liquid crystal spatial light modulator (LCSLM) to control wavefront. However, the disadvantage of its inherent nonlinear phase response will decrease the wavefront control accuracy.
Zhang H., Zhou H., Li J., Qiao Y. J., Si J., Gao W.   +5 more
doaj   +1 more source

Focusing and Compression of Ultrashort Pulses through Scattering Media [PDF]

, 2011
Light scattering in inhomogeneous media induces wavefront distortions which pose an inherent limitation in many optical applications. Examples range from microscopy and nanosurgery to astronomy.
A Assion, A Derode, AM Weiner, BA Wilt, BJ Pearson, BK Andrasfalvy, C-L Hsieh, D Oron, D Oron, D Yelin, E Small, E Tal, Eran Small, F Lemoult, G Lerosey, H Rabitz, H Szmacinski, IM Vellekoop, IM Vellekoop, IM Vellekoop, IM Vellekoop, IM Vellekoop, J Aulbach, JC Diels, JM Dela Cruz, JW Goodman, M Aeschlimann, M Cui, M Fink, M Oheim, M Rueckel, MA Webster, MI Stockman, MJ Booth, NC Bruce, Ori Katz, P Sebbah, PM Johnson, RK Tyson, S Popoff, SM Popoff, T Čižmár, W Denk, Y Jiang, Yaron Bromberg, Yaron Silberberg, Z Yaqoob   +46 more
core   +1 more source

Simulation-based design optimization of the holographic wavefront sensor in closed-loop adaptive optics

Light: Advanced Manufacturing, 2022
Adaptive optics systems are used to compensate for wavefront distortions introduced by atmospheric turbulence. The distortions are corrected by an adaptable device, normally a deformable mirror.
Andreas Zepp, Szymon Gladysz, Karin Stein, Wolfgang Osten   +3 more
doaj   +1 more source

Coherent Raman Generation Controlled by Wavefront Shaping [PDF]

Scientific Reports, 2019
AbstractWe investigate the possibility of tailoring coherent Raman generated spectra via adaptive wavefront optimization. Our technique combines a spatial light modulator and a spectrometer providing a feedback loop. The algorithm is capable of controlling the Raman generation, producing broader spectra and an improved overall efficiency, and ...
Shutova, Mariia, Shutov, Anton D., Zhdanova, Alexandra A., Thompson, Jonathan V., Sokolov, Alexei V.   +4 more
openaire   +2 more sources

Coupling Plasmonic System for Efficient Wavefront Control

ACS Applied Materials & Interfaces, 2021
Efficient and flexible manipulation of electromagnetic waves using metasurfaces has attracted continuous attention in recent years. However, previous studies mainly apply sole resonance effect to accomplish the task. Here, we show that introducing a meta-coupling effect would reveal further physical insights in the electromagnetic wave control.
Li Niu, Quan Xu, Xueqian Zhang, Ziying Zhang, Shaoxian Li, Xieyu Chen, Yuehong Xu, Jiajun Ma, Ming Kang, Jiaguang Han, Weili Zhang   +10 more
openaire   +3 more sources

Real-time wavefront aberrometry in subjects with accommodative excess [PDF]

EPJ Web of Conferences, 2023
The purpose of this study was to use real-time wavefront aberrometry to detect accommodative excess (AE) and to analyse the optical quality of the eye in subjects with this dysfunction.
Gomes Jessica, Sapkota Kishor, Franco Sandra   +2 more
doaj   +1 more source

Active nonlocal metasurfaces

Nanophotonics, 2020
Actively tunable and reconfigurable wavefront shaping by optical metasurfaces poses a significant technical challenge often requiring unconventional materials engineering and nanofabrication.
Malek Stephanie C., Overvig Adam C., Shrestha Sajan, Yu Nanfang   +3 more
doaj   +1 more source

Optimization of Iterative Control Algorithms for High-Resolution Adaptive Optics Systems

IEEE Photonics Journal
As the number of wavefront sensor subapertures and deformable mirror actuators in adaptive optics systems increases, the computational time of the direct gradient wavefront control algorithm is excessively long, which is a major factor affecting the ...
Shenghu Liu, Wang Zhao, Shuai Wang, Kangjian Yang, Ping Yang, Hongli Guan, Han Guo, Ruifeng He   +7 more
doaj   +1 more source