Results 21 to 30 of about 1,162,754 (126)

Highly Stable Spatio-Temporal Prediction Network of Wavefront Sensor Slopes in Adaptive Optics

Sensors, 2023
Adaptive Optics (AO) technology is an effective means to compensate for wavefront distortion, but its inherent delay error will cause the compensation wavefront on the deformable mirror (DM) to lag behind the changes in the distorted wavefront ...
Ning Wang, Licheng Zhu, Qiang Yuan, Xinlan Ge, Zeyu Gao, Shuai Wang, Ping Yang   +6 more
doaj   +1 more source

Expanded Scene Image Preprocessing Method for the Shack–Hartmann Wavefront Sensor

Applied Sciences, 2023
Due to the influence of atmospheric turbulence, the detector, and background noise, the subaperture image of an extended scene Shack–Hartmann wavefront sensor will have a low signal-to-noise ratio, which will introduce errors to the offset estimation and
Bo Chen, Jingjing Jia, Yilin Zhou, Yirui Zhang, Zhaoyi Li   +4 more
doaj   +1 more source

Atmospheric Turbulence with Kolmogorov Spectra: Software Simulation, Real-Time Reconstruction and Compensation by Means of Adaptive Optical System with Bimorph and Stacked-Actuator Deformable Mirrors

Photonics, 2023
Atmospheric turbulence causes refractive index fluctuations, which in turn introduce extra distortions to the wavefront of the propagated radiation. It ultimately degrades telescope resolution (in imaging applications) and reduces radiation power density
Ilya Galaktionov, Julia Sheldakova, Vadim Samarkin, Vladimir Toporovsky, Alexis Kudryashov   +4 more
doaj   +1 more source

Wide-Aperture Bimorph Deformable Mirror for Beam Focusing in 4.2 PW Ti:Sa Laser

Applied Sciences, 2022
The bimorph deformable mirror with a diameter of 320 mm, including 127 control electrodes, has been developed and tested. The flatness of the initial mirror surface of about 1 μm (P-V) was achieved by mechanically adjusting the mirror substrate fixed in ...
Vadim Samarkin, Alexander Alexandrov, Ilya Galaktionov, Alexis Kudryashov, Alexander Nikitin, Alexey Rukosuev, Vladimir Toporovsky, Julia Sheldakova   +7 more
doaj   +1 more source

Simplifying the detection of optical distortions by machine learning [PDF]

Journal of Innovative Optical Health Sciences, 2020
Adaptive optics has been widely used in biological science to recover high-resolution optical image deep into the tissue, where optical distortion detection with high speed and accuracy is strongly required.
Shuwen Hu, Lejia Hu, Biwei Zhang, Wei Gong, Ke Si   +4 more
doaj   +1 more source

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

Lateral Shearing Interferometry based on a Polarization Grating for Wavefront Sensing [PDF]

한국정밀공학회지, 2022
In this investigation, we propose a simple and effective lateral shearing interferometer based on a polarization grating. In the lateral shearing device, an incident beam is split into two beams by a polarization grating, and the returning beams can be ...
Hyo Bin Jeong, Hyo Mi Park, Ki-Nam Joo
doaj   +1 more source

Shack-Hartmann and Interferometric Hybrid Wavefront Sensor [PDF]

, 2011
This document reports results of wave-optics simulations used to test the performance of a hybrid wavefront sensor designed to combine the self-referencing interferometer and Shack-Hartmann wavefront sensors in an optimal way.
Ellis, Troy R.
core   +1 more source

Wavefront Reconstruction of Shack-Hartmann with Under-Sampling of Sub-Apertures

Photonics, 2023
Shack-Hartmann wavefront sensor plays a key role in adaptive optics (AO) systems, which detect the aberrant wavefront by an array of micro-lenslets across the aperture pupil.
Jian Huang, Lianqun Yao, Shuyun Wu, Gongchang Wang   +3 more
doaj   +1 more source

Adaptive Hartmann–Shack Wavefront Sensor

Photonics
In this work, an adaptive Hartmann–Shack wavefront sensor (AHSS) is proposed, designed, and evaluated. This sensor allows for the modification in the dynamic range of wavefront aberration measurement, defined as the range between the minimum and maximum ...
Jennyfer Morales-Marín, Walter Torres-Sepúlveda, Alejandro Mira-Agudelo   +2 more
doaj   +1 more source