Results 91 to 100 of about 2,024,523 (345)
Complex Structured Light Generation Using Printed Liquid Crystal Droplets
Advanced Optical Materials, EarlyView.Inkjet‐printed liquid crystal droplets generate structured light beams with spatially varying polarization and phase. These include full Poincaré beam, vortex beam carrying orbital angular momentum, and beam with polarization singularities, offering a simple approach for compact structured light generation in optical manipulation, imaging, and ...
Xuke Qiu +12 more
wiley +1 more source
Pyramid Wavefront Sensor Using a Discrete Modulated Operation Method
IEEE Photonics JournalThe adaptive optics system (AOS) incorporating a modulated pyramid wavefront sensor (PWFS) represents a key area of exploration in current research aimed at enhancing the capabilities of future extremely large astronomical telescopes.
Lu Chen +6 more
doaj +1 more source
Sensing and control of segmented mirrors with a pyramid wavefront sensor in the presence of spiders [PDF]
, 2018 The segmentation of the telescope pupil (by spiders & the segmented M4) create areas of phase isolated by the width of the spiders on the wavefront sensor (WFS), breaking the spatial continuity of the wavefront.
N. Schwartz +11 more
semanticscholar +1 more source
Development of a wavefront sensor for terahertz pulses
Optics Express, 2016 Wavefront characterization of terahertz pulses is essential to optimize far-field intensity distribution of time-domain (imaging) spectrometers or increase the peak power of intense terahertz sources. In this paper, we report on the wavefront measurement of terahertz pulses using a Hartmann sensor associated with a 2D electro-optic imaging system ...
Abraham, Emmanuel +5 more
openaire +4 more sources
Tunable Multifunctional Terahertz Coding Metasurface for Polarization Manipulation
Advanced Photonics Research, EarlyView.Coding metasurfaces (CMs) offer versatile control over electromagnetic waves. Herein, a tunable multifunctional terahertz (THz) metasurface integrated with vanadium dioxide (VO2) is presented, enabling propagation‐phase manipulation of linearly polarized waves and hybrid‐phase control of circularly polarized waves.
Chunsheng Zhang +10 more
wiley +1 more source
Wavefront Aberration Sensor Based on a Multichannel Diffractive Optical Element
Italian National Conference on Sensors, 2020 We propose a new type of a wavefront aberration sensor, that is, a Zernike matched multichannel diffractive optical filter, which performs consistent filtering of phase distributions corresponding to Zernike polynomials. The sensitivity of the new sensor
S. Khonina, S. Karpeev, A. Porfirev
semanticscholar +1 more source
The Asymmetric Pupil Fourier Wavefront Sensor [PDF]
Publications of the Astronomical Society of the Pacific, 2013 5 figures, accepted for publication by ...
openaire +4 more sources
Techniques and Advances in Ultrafast Photography
Advanced Photonics Research, EarlyView.This review maps the fast‐growing field of ultrafast photography from early mechanical cameras to modern optical‐computational methods. It organizes techniques into four families (multishot passive/active; single‐shot passive/active), explains how they reach trillion‐frame‐per‐second speeds, compares capabilities and tradeoffs, and highlights ...
Chen Huang +10 more
wiley +1 more source
PhotonicsAtmospheric 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
Testing and characterization of challenging optics and optical systems with Shack Hartmann wavefront sensors [PDF]
EPJ Web of Conferences, 2019 The Shack-Hartman wavefront sensor is a common metrology tool in the field of laser, adaptive optics and astronomy. However, this technique is still scarcely used in optics and optical system metrology.
Siv Julie +5 more
doaj +1 more source