Results 101 to 110 of about 43,714 (202)

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

Compressive Wavefront Sensing with Weak Values [PDF]

, 2014
We demonstrate a wavefront sensor based on the compressive sensing, single-pixel camera. Using a high-resolution spatial light modulator (SLM) as a variable waveplate, we weakly couple an optical field's transverse-position and polarization degrees of freedom.
arxiv   +1 more source

Subaperture wavefront measurement using Talbot interferometry [PDF]

, 2016
A method based on sub aperture stitching for measurement of a freeform wavefront is proposed and applied to wavefronts calculated from the slope data acquired using a Talbot wavefront sensor.
Bichra, Mohamed, Khan, Gufran Sayeed, Pant, Kamal, Ramu, D., Sabitov, Nail, Sinzinger, Stefan   +5 more
core  

Phase imaging by spatial wavefront sampling [PDF]

, 2017
Phase imaging techniques extract the optical path-length information of a scene, whereas wavefront sensors provide the shape of an optical wavefront. Since these two applications have different technical requirements, they have developed their own specific technology.
arxiv   +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

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

Integrated Laboratory Demonstrations of Multi-Object Adaptive Optics on a Simulated 10-Meter Telescope at Visible Wavelengths

, 2009
One important frontier for astronomical adaptive optics (AO) involves methods such as Multi-Object AO and Multi-Conjugate AO that have the potential to give a significantly larger field of view than conventional AO techniques.
Ammons, S. Mark, Bauman, Brian J., Gavel, Donald T., Johnson, Luke, Kupke, Renate, Laag, Edward A., Max, Claire E.   +6 more
core   +1 more source

Broadband, Common-Path, Interferometric Wavefront Sensor [PDF]

Hybrid sensors comprising Shack-Hartmann Wavefront Sensor (S-HWFS) and Zernike Wavefront Sensor (Z-WFS) capabilities are presented. The hybrid sensor includes a Z-WFS optically arranged in-line with a S-HWFS such that the combined wavefront sensor ...
Wallace, James Kent
core   +1 more source

Open-loop Wavefront Sensing in the Presence of Speckle and Weak Scintillation [PDF]

In this paper, we show that speckle averaging helps to reduce the measurement error associated with a Shack–Hartmann wavefront sensor (SHWFS); however, this reduction is rendered ineffective with increasing beacon anisoplanatism.
Burrell, Derek J., Driggers, Ronald G., Spencer, Mark F.   +2 more
core   +2 more sources

Shack-Hartmann wavefront sensor optical dynamic range. [PDF]

Opt Express, 2021
Akondi V, Dubra A.
europepmc   +1 more source