Results 81 to 90 of about 11,638 (169)

Thermal analysis and experimental study of end-pumped Nd: YLF laser at 1053 nm

Photonic Sensors, 2017
We have numerically analyzed the thermal effects in Nd: YLF laser rod. The calculations of temperature and stress distributions in the Nd: YLF laser rod was performed with finite element (FE) simulations.
R. M. El-Agmy, N. Al-Hosiny
doaj   +1 more source

Deep learning enabled robust wavefront sensing for active beam smoothing with a continuous phase modulator

High Power Laser Science and Engineering
In 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, Yifan Zhang, Liquan Guo, Pei Li, Zichao Wang, Yongchen Zhuang, Shibing Lin, Qiao Xue, Deen Wang, Lei Huang   +9 more
doaj   +1 more source

Experimental detection of optical vortices with a Shack-Hartmann wavefront sensor.

Optics Express, 2010
Laboratory experiments are carried out to detect optical vortices in conditions typical of those experienced when a laser beam is propagated through the atmosphere.
K. Murphy, Daniel Burke, N. Devaney, C. Dainty   +3 more
semanticscholar   +1 more source

Lorentz Force Actuated Tunable-Focus Liquid Lens

Micromachines, 2019
Tunable-focus liquid lenses provide focal length tuning for optical systems, e.g., cameras, where physical movement of rigid lenses are not an option or not preferable.
Kari L. Van Grinsven, Alireza Ousati Ashtiani, Hongrui Jiang   +2 more
doaj   +1 more source

A Multi-Deformable-Mirror 500 Hz Adaptive Optical System for Atmospheric Turbulence Simulation, Real-Time Reconstruction, and Wavefront Correction Using Bimorph and Tip-Tilt Correctors

Photonics
Atmospheric turbulence introduces distortions to the wavefront of propagating optical radiation. It causes image resolution degradation in astronomical telescopes and significantly reduces the power density of radiation on the target in focusing ...
Ilya Galaktionov, Vladimir Toporovsky
doaj   +1 more source

Flexible Electrowetting-on-Dielectric Microlens Array Sheet

Micromachines, 2019
We have fabricated a fully-flexible, focus-tunable microlens array on a sheet and demonstrated its imaging capabilities. Each liquid lens of the array is individually tunable via electrowetting on dielectric (EWOD) actuation and is situated on a ...
Kari L. Van Grinsven, Alireza Ousati Ashtiani, Hongrui Jiang   +2 more
doaj   +1 more source

Multi-Spectral and Single-Shot Wavefront Detection Technique Based on Neural Networks

Photonics
Conventional wavefront sensors face challenges when detecting frequency-domain information. In this study, we developed a high-precision, and fast multi-spectral wavefront detection technique based on neural networks.
Xunzheng Li, Aoyang Wang, Mao Fan, Lianghong Yu, Xiaoyan Liang   +4 more
doaj   +1 more source

Microlens Array-Based Beam Profile and Wavefront Sensor With Physical Constraint Learning

IEEE Photonics Journal
The beam profile and wavefront characteristics of laser beams are essential for numerous laser applications, including micromachining and microfabrication.
Feng-Chun Hsu, Chun-Yu Lin, Chia-Yuan Chang, Shean-Jen Chen   +3 more
doaj   +1 more source

Compact Fundus Imaging System Using Shack-Hartmann Wavefront Sensing for High-speed Auto-focus

Shengwu huaxue yu shengwu wuli jinzhan
ObjectiveThe widespread adoption of portable fundus cameras for primary care and community screening is hindered by limitations in current autofocus(AF) technologies.
LIN Zhe-Kai, CHEN Long, ZHENG Geng-Yong, HUANG Jin-Tian, DONG Jia-Xin, YANG Shang-Pan, DING Wen-Zheng, HAN Ding-An, WANG Xue-Hua, ZENG Ya-Guang   +9 more
doaj   +1 more source

Two-photon Shack-Hartmann wavefront sensor. [PDF]

Opt Lett, 2017
Xia F, Sinefeld D, Li B, Xu C.
europepmc   +1 more source