Results 31 to 40 of about 2,202 (209)

Magnetic Field Structure in Relativistic Jets

EPJ Web of Conferences, 2013
Relativistic jets are ubiquitous when considering an accreting black hole. Two of the most extreme examples of these systems are blazars and gamma-ray bursts (GRBs), the jets of which are thought to be threaded with a magnetic field of unknown structure.
Jermak Helen, Mundell Carole, Steele Iain, Harrison Richard, Kobayashi Shiho, Lindfors Elina, Nilsson Kari, Barres de Almeida Ulisses   +7 more
doaj   +1 more source

High speed partial Stokes imaging using a ferroelectric liquid crystal modulator [PDF]

Journal of the European Optical Society-Rapid Publications, 2008
This paper describes the implementation of an imaging polarimeter using a single ferroelectric liquid crystal light modulator. It provides partial imaging Stokes information at 234 Hz, much faster than polarimeters using nematic light modulators.
Jaulin Albéric, Bigué Laurent
doaj   +1 more source

The Galway astronomical Stokes polarimeter: optical development

EPJ Web of Conferences, 2010
The acquisition time of astronomical polarimeters has in the past been restricted to by the use of polarimeters utilizing modulated or rotating components [1].
Sheehan B., Shearer A., Redfern M., Collins P.   +3 more
doaj   +1 more source

Liquid-crystal based drift-free polarization modulators: Part II. Ultra-stable Stokes and Mueller polarimeters

, 2023
We have previously reported a new design for drift-free liquid-crystal polarization modulators (LCMs) based on liquid-crystal variable retarders (LCVRs). Here, we study their performance on Stokes and Mueller polarimeters.
Zallat, Jihad, Varin, B. (Briseis), Dellinger, J. (Jean), Torzynski, Marc, Takakura, Y. (Yoshitate), Rehbinder, J. (Jean), Rehbinder, Jean, Heinrich, Christian, Torzynski, M. (Marc), Heinrich, C. (Christian), Dellinger, Jean, Takakura, Yoshitate, Zallat, J. (Jihad), Varin, Briseis   +13 more
core   +1 more source

Fundamental limitations of the polarization purity of x rays

APL Photonics, 2018
For a few years, x-ray polarimeters have been discussed and even used as a key method for the investigation of fundamental physical questions, from quantum electrodynamics to solid state physics. However, the sensitivity of optical instruments is limited.
K. S. Schulze
doaj   +1 more source

Towards perfectly linearly polarized x-rays

Physical Review Research, 2022
In recent years, high-precision x-ray polarimeters have become a key method for the investigation of fundamental physical questions from solid-state physics to quantum optics.
Kai S. Schulze, Benjamin Grabiger, Robert Loetzsch, Berit Marx-Glowna, Annika T. Schmitt, Alejandro Laso Garcia, Willi Hippler, Lingen Huang, Felix Karbstein, Zuzana Konôpková, Hans-Peter Schlenvoigt, Jan-Patrick Schwinkendorf, Cornelius Strohm, Toma Toncian, Ingo Uschmann, Hans-Christian Wille, Ulf Zastrau, Ralf Röhlsberger, Thomas Stöhlker, Thomas E. Cowan, Gerhard G. Paulus   +20 more
doaj   +1 more source

Revisiting Securidaca longipedunculata Seed Oil: Applying NMR and Mass Spectroscopy to Confirm the Presence of 2‐Acetyl‐1,3‐Diacyl–sn‐Glycerols and Conjugated Hydroxydienoic Fatty Acids

Journal of the American Oil Chemists' Society, EarlyView.
The manuscript confirms and expands on previous reports concerning the presence of unusual conjugated hydroxydienoic fatty acids and acetyl‐TAG in the seed oil of Securidaca longipedunculata. The location of acetate only at sn‐2 of TAG was conclusively shown by high resolution NMR and hydroxy seed fatty acids are characterized.
Mark A. Smith, Jianfeng Zhu, Jin‐Yue Sun   +2 more
wiley   +1 more source

Training a Dataset Simulated Using RGB Images for an End-to-End Event-Based DoLP Recovery Network

Photonics
Event cameras are bio-inspired neuromorphic sensors that have emerged in recent years, with advantages such as high temporal resolutions, high dynamic ranges, low latency, and low power consumption.
Changda Yan, Xia Wang, Xin Zhang, Conghe Wang, Qiyang Sun, Yifan Zuo   +5 more
doaj   +1 more source

Derivation of Instrument Requirements for Polarimetry Using Mg, Fe, and Mn Lines between 250 and 290 nm

The Astrophysical Journal, 2023
Judge et al. recently argued that a region of the solar spectrum in the near-UV between about 250 and 290 nm is optimal for studying magnetism in the solar chromosphere, due to an abundance of Mg ii , Fe ii , and Fe i lines that sample various heights in
A. G. de Wijn, P. G. Judge, R. Ezzeddine, A. Sainz Dalda   +3 more
doaj   +1 more source

Polarization‐Dependence of Nonlinear Optical Effects in Silicon: The Case of Ultrafast Processing

Advanced Physics Research, EarlyView.
The dependence of the input polarization for the nonlinear optical propagation in silicon is investigated theoretically and experimentally. The perturbative regime is examined using pump‐probe shadowgraphy and nonlinear transmission, whereas the case of permanent laser‐induced modifications is addressed using a combination of Raman micro‐spectroscopy ...
Namig Alasgarzade, Alessandro Alberucci, Stree V. Arumugam, Markus Blothe, Maxime Chambonneau, Chandroth P. Jisha, Stefan Nolte   +6 more
wiley   +1 more source