A general theoretical approach based on the decomposition of statistical fields into a sum of independently propagating transverse modes was used for the analysis of the coherence properties of the new free-electron laser source FLASH operated at 13.7 nm wavelength. The analysis shows that several transverse modes are contributing to the total radiation field of FLASH. The results of theoretical calculations are compared with measurements using Young's double-slit experiment. The coherence lengths in the horizontal and in the vertical directions 20 m downstream from the source are estimated at 300 and 250 microm, respectively.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.101.254801 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Anisotropic Plasmon Resonance in TiCT MXene Enables Site-Selective Plasmonic Catalysis.
ACS Nano
January 2025
Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, PR China.
The ever-growing interest in MXenes has been driven by their distinct electrical, thermal, mechanical, and optical properties. In this context, further revealing their physicochemical attributes remains the key frontier of MXene materials. Herein, we report the anisotropic localized surface plasmon resonance (LSPR) features in TiCT MXene as well as site-selective photocatalysis enabled by the photophysical anisotropy.
View Article and Find Full Text PDFMatched Guiding and Controlled Injection in Dark-Current-Free, 10-GeV-Class, Channel-Guided Laser-Plasma Accelerators.
Phys Rev Lett
December 2024
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Article Synopsis
- Researchers investigated how high-intensity laser pulses propagate through a plasma channel by adjusting its length, successfully guiding 500 terawatt pulses over distances of 30 cm in hydrogen plasma.
- They observed the initial energy transfer involving higher-order modes and a transition to more efficient propagation, noting a depletion of laser energy that generates wakefields.
- Utilizing 21.3 joules of laser energy for localized electron injection, they achieved electron bunches with nearly monenergetic peaks reaching 9.2 GeV and total charge exceeding 10 GeV.
Prediction and observation of topological modes in fractal nonlinear optics.
Light Sci Appl
January 2025
Department of Physical Electronics, School of Electrical Engineering, Faculty of Engineering, and Center for Light-Matter Interaction, Tel Aviv University, Tel Aviv, Israel.
This item from the News and Views (N&V) category aims to provide a summary of theoretical and experimental results recently published in ref. , which demonstrates the creation of corner modes in nonlinear optical waveguides of the higher-order topological insulator (HOTI) type. Actually, these are second-order HOTIs, in which the transverse dimension of the topologically protected edge modes is smaller than the bulk dimension (it is 2, in the case of optical waveguide) by 2, implying zero dimension of the protected modes, which are actually realized as corner or defect ones.
View Article and Find Full Text PDFWe treat edge-mode resonance that may exist at boundaries of transversely finite beams illuminating a photonic lattice. The lattice is in the dark state signifying a perfect bound state in the continuum (BIC). The dark state is non-radiative in symmetric systems because lateral waves cannot couple to the lattice due to destructive interference between counter-propagating waves.
View Article and Find Full Text PDFCandidate Toroidal Electric Dipole Mode in the Spherical Nucleus ^{58}Ni.
Phys Rev Lett
December 2024
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
Dipole toroidal modes appear in many fields of physics. In nuclei, such a mode was predicted more than 50 years ago, but clear experimental evidence was lacking so far. Using a combination of high-resolution inelastic scattering experiments with photons, electrons, and protons, we identify for the first time candidates for toroidal dipole excitations in the nucleus ^{58}Ni and demonstrate that transverse electron scattering form factors represent a relevant experimental observable to prove their nature.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!