Results 71 to 80 of about 26,873 (277)
On-sky multi-wavelength phasing of segmented telescopes with the Zernike phase contrast sensor
, 2011 Future Extremely Large Telescopes will adopt segmented primary mirrors with several hundreds of segments. Cophasing of the segments together is essential to reach high wavefront quality.
Cavarroc +20 more
core +3 more sources
Decoding THz‐Driven Dynamic Fingerprints of Ferroelectric Nanotwin Networks
Advanced Materials, EarlyView.ABSTRACT Ultrafast polarization dynamics in ferroelectrics are of considerable interest for high‐speed tunable dielectrics and electro‐optics. Extended domain wall networks formed in ferroelectric twin nanodomains can support collective dynamics in the terahertz regime but require techniques that track polarization and strain evolution driven by ...
Xiaojiang Li +20 more
wiley +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 +3 more
doaj +1 more source
Advanced holographic wavefront sensor [PDF]
SPIE Proceedings, 2017 Optical science and technologies require fast and precise measurements of wavefront curvature. Amount of wavefront measurement methods increased in the last few years. The important part of the modern wavefront sensors are holographic optical elements (HOE). This article shows a possibility of using HOE for generating Zernike aberration modes.
Alina Gorelaya +6 more
openaire +1 more source
Ingot Laser Guide Stars Wavefront Sensing
, 2017 We revisit one class of z-invariant WaveFront sensor where the LGS is fired aside of the telescope aperture. In this way there is a spatial dependence on the focal plane with respect to the height where the resonant scattering occurs. We revise the basic
Bergomi, Maria +13 more
core +1 more source
Multiple Spatial Frequencies Pyramid WaveFront Sensing [PDF]
, 2017 A modification of the pyramid wavefront sensor is described. In this conceptually new class of devices, the perturbations are split at the level of the focal plane depending upon their spatial frequencies, and then measured separately.
Bergomi, Maria +13 more
core +1 more source
Advanced Materials Technologies, EarlyView.Transducers convert physical signals into electrical and optical representations, yet each mechanism is bounded by intrinsic trade‐offs across bandwidth, sensitivity, speed, and energy. This review maps transduction mechanisms across physical scale and frequency, showing how heterogeneous integration and multiphysics co‐design transform isolated ...
Aolei Xu +8 more
wiley +1 more source
Wavefront Sensor for Laser Beams Based on Reweighted Amplitude Flow Algorithm
Applied SciencesWe present a reference-free computational wavefront sensor based on binary amplitude modulation and phase retrieval. The method employs a Digital Micromirror Device as a programmable amplitude modulator and reconstructs the complex optical field from ...
Ondřej Denk +4 more
doaj +1 more source
, 2018 In this paper, we address the inverse problem of fast, stable, and high-quality wavefront reconstruction from pyramid wavefront sensor data for Adaptive Optics systems on Extremely Large Telescopes.
Hutterer, Victoria +2 more
core +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 ...
Howell, John C. +2 more
core +3 more sources