Explanipedia

Thermal Lensing and Small Signal Gain Measurements in Pulsed Blue Diode Pumped Ti:sapphire Amplifier at Room Temperature Open

Daniel Hug, A. Dax, A. Trisorio, Romain Carreto, Thomas Südmeyer , et al. · 2024

Ultra short pulse Ti:sapphire lasers, crucial for most demanding applications, have traditionally been complex and costly due to their pump sources. GaN-based laser diodes offer new prospects for pumping, yet challenges persist in achievin…

Dynamic thermal analysis of pulsed blue diode pumped Ti:Sapphire amplifiers Open

Daniel Hug, Manuel Zeyen, A. Dax, A. Trisorio, Romain Carreto , et al. · 2024

We simulated the time-dependent temperature profiles inside a blue diode pumped Ti:Sapphire (Ti:Sa) laser amplifier for several different pulsed pump configurations using a discrete element method, including temperature-dependent thermal c…

An X-ray free-electron laser with a highly configurable undulator and integrated chicanes for tailored pulse properties Open

Eduard Prat, André Al Haddad, Christopher Arrell, Sven Augustin, Marco Boll , et al. · 2023

The helion charge radius from laser spectroscopy of muonic helium-3 ions Open

The CREMA Collaboration, Karsten Schuhmann, L. M. P. Fernandes, F. Nez, Marwan Abdou Ahmed , et al. · 2023

Hydrogen-like light muonic ions, in which one negative muon replaces all the electrons, are extremely sensitive probes of nuclear structure, because the large muon mass increases tremendously the wave function overlap with the nucleus. Usi…

Demonstration of two-color x-ray FEL by laser emittance spoiler Open

C. Vicario, Christopher Arrell, S. Bettoni, A. Dax, Philipp Dijkstal , et al. · 2023

Two-color is an emerging mode of operation in X-ray Free Electron Laser (FEL) having the potential to expand the pump and probe experiments toward fs temporal resolution and to site-selective spectroscopy. A novel and quick to setup method…

SwissFEL double bunch operation Open

M. Paraliev, Arturo Alarcon, V. Arsov, S. Bettoni, Roger Biffiger , et al. · 2022

SwissFEL has a unique capability, among the normal conducting linac-based light sources, to simultaneously serve two separate undulator lines (Aramis and Athos) up to the machine repetition rate of 100 Hz using the double bunch operation m…

Laser spectroscopy of long-lived pionic and antiprotonic helium in superfluid helium Open

M. Hori, H. Aghai–Khozani, A. Sótér, A. Dax, D. Barna , et al. · 2022

The PiHe collaboration of PSI recently carried out laser spectroscopy of an infrared transition in three-body pionic helium atoms that were synthesized in a superfluid (He-II) helium target. Analogous measurements of antiprotonic helium at…

Laser spectroscopic studies of long-lived pionic helium at PSI Open

M. Hori, H. Aghai–Khozani, A. Sótér, A. Dax, D. Barna · 2022

A recent laser spectroscopy experiment of three-body pionic helium atoms which was carried out using the 590 MeV ring cyclotron facility of the Paul Scherrer Institute (PSI) is briefly reviewed. The charged pion mass may be precisely deter…

Arrival time fluctuation of the SwissFEL photocathode laser: characterization by a single color balanced cross correlator Open

A. Dax, Cezary Sydlo, E. J. Divall, C. P. Hauri, Martin Huppert , et al. · 2022

The arrival time jitter and drift of the photocathode drive laser has an important impact on the performance of a Free-Electron-Laser (FEL). It adversely affects the beam energy jitter, bunch length jitter and bunch arrival time jitter, wh…

High-resolution laser resonances of antiprotonic helium in superfluid 4He Open

A. Sótér, H. Aghai–Khozani, D. Barna, A. Dax, L. Venturelli , et al. · 2022

When atoms are placed into liquids, their optical spectral lines corresponding to the electronic transitions are greatly broadened compared to those of single, isolated atoms. This linewidth increase can often reach a factor of more than a…

Recent progress of laser spectroscopy measurements of pionic helium Open

M. Hori, H. Aghai–Khozani, A. Sótér, A. Dax, D. Barna · 2022

We review the results of recent laser spectroscopy experiments on metastable pionic helium atoms at the Paul Scherrer Institute’s 590 MeV cyclotron facility that was carried out by the PiHe collaboration. Some future perspectives are brief…

Recent results of laser spectroscopy experiments of pionic helium atoms at PSI Open

M. Hori, H. Aghai-Khozani, A. Sótér, A. Dax, D. Barna · 2021

A review of a recent experiment carried out at PSI involving laser spectroscopy of metastable pionic helium ( \pi{^4He}^+\equiv\pi^{-}+{^4He}^{2+}+e^- ) atoms is presented. An infrared transition (n,\ell)=(17,16…

Ultrafast electron localization in the EuNi2(Si0.21Ge0.79)(2) correlated metal Open

J. R. L. Mardegan, Serhane Zerdane, Giulia F. Mancini, Vincent Esposito, Jérémy R. Rouxel , et al. · 2021

Ultrafast electron delocalization induced by a femtosecond laser pulse is a well-known process in which electrons are ejected from the ions within the laser pulse duration. However, very little is known about the speed of electron localiza…

Experimental demonstration of two-color x-ray free-electron-laser pulses via wakefield excitation Open

S. Bettoni, P. Craievich, A. Dax, R. Ganter, Marc Guetg , et al. · 2021

Several beam manipulation methods have been studied and experimentally demonstrated to generate x-ray multipulses in free-electron-laser (FEL) facilities, advancing the fields of material science, molecular physics, and photochemistry by e…

Laser Spectroscopy Measurements of Metastable Pionic Helium Atoms at Paul Scherrer Institute Open

M. Hori, H. Aghai-Khozani, A. Sótér, A. Dax, D. Barna · 2021

Two-color x-ray free-electron laser by photocathode laser emittance spoiler Open

C. Vicario, S. Bettoni, Alberto Lutman, A. Dax, Martin Huppert , et al. · 2021

Multispectral x-ray pump-probe experiments call for synchronized two-color free-electron lasers (FEL). This mode often implies a laborious setup or an inefficient use of the undulator. We report on a simple and noninvasive approach tested …

Report on scipost_202101_00002v2 Open

M. Hori, H. Aghai–Khozani, A. Sótér, A. Dax, D. Barna · 2021

A review of a recent experiment carried out at PSI involving laser spectroscopy of metastable pionic helium (π 4 He + ≡ π -+ 4 He 2+ + e -) atoms is presented.An infrared transition (n, ) = (17, 16)→(17, 15) at a resonance frequency of ν ≈…

Publisher Correction: Measuring the α-particle charge radius with muonic helium-4 ions Open

Julian J. Krauth, Karsten Schuhmann, Marwan Abdou Ahmed, F. D. Amaro, Pedro Amaro , et al. · 2021

Report on scipost_202101_00002v1 Open

M. Hori, H. Aghai–Khozani, A. Sótér, A. Dax, D. Barna · 2021

A review of a recent experiment carried out at PSI involving laser spectroscopy of metastable pionic helium (π 4 He + ≡ π -+ 4 He 2+ + e -) atoms is presented.An infrared transition (n, ) = (17, 16)→(17, 15) at a resonance frequency of ν ≈…

Measuring the α-particle charge radius with muonic helium-4 ions Open

Julian J. Krauth, Karsten Schuhmann, Marwan Abdou Ahmed, F. D. Amaro, Pedro Amaro , et al. · 2021

Overview of SwissFEL dual-photocathode laser capabilities and perspectives for exotic FEL modes Open

S. Bettoni, A. L. Cavalieri, A. Dax, E. J. Divall, C. P. Hauri , et al. · 2021

SwissFEL is a compact, high-brilliance, soft and hard X-ray free electron laser (FEL) facility that started user operation in 2019. The facility is composed of two parallel beam lines seeded by a common linear accelerator (LINAC), and a tw…

A compact and cost-effective hard X-ray free-electron laser driven by a high-brightness and low-energy electron beam Open

Eduard Prat, R. Abela, M. Aiba, Arturo Alarcon, Jürgen Alex , et al. · 2020

The SwissFEL soft X-ray free-electron laser beamline: Athos Open

R. Abela, Arturo Alarcon, Jürgen Alex, Christopher Arrell, V. Arsov , et al. · 2019

The SwissFEL soft X-ray free-electron laser (FEL) beamline Athos will be ready for user operation in 2021. Its design includes a novel layout of alternating magnetic chicanes and short undulator segments. Together with the APPLE X architec…

Erratum to: Hadronic shift in pionic hydrogen Open

M. Hennebach, D. F. Anagnostopoulos, A. Dax, H. Fuhrmann, D. Gotta , et al. · 2019

Laser Spectroscopy of Muonic Atoms and Ions Open

Randolf Pohl, F. Nez, L. M. P. Fernandes, Marwan Abdou Ahmed, F. D. Amaro , et al. · 2017

Laser spectroscopy of the Lamb shift (2S-2P energy difference) in light muonic atoms or ions, in which one negative muon $μ^-$ is bound to a nucleus, has been performed. The measurements yield significantly improved values of the root-mean…

SwissFEL: The Swiss X-ray Free Electron Laser Open

Christopher J. Milne, Thomas Schietinger, M. Aiba, Arturo Alarcon, Jürgen Alex , et al. · 2017

The SwissFEL X-ray Free Electron Laser (XFEL) facility started construction at the Paul Scherrer Institute (Villigen, Switzerland) in 2013 and will be ready to accept its first users in 2018 on the Aramis hard X-ray branch. In the followin…

The proton radius puzzle Open

Julian J. Krauth, Karsten Schuhmann, Marwan Abdou Ahmed, F. D. Amaro, Pedro Amaro , et al. · 2017

High-precision measurements of the proton radius from laser spectroscopy of muonic hydrogen demonstrated up to six standard deviations smaller values than obtained from electron-proton scattering and hydrogen spectroscopy. The status of th…

High precision hyperfine measurements in Bismuth challenge bound-state strong-field QED Open

Johannes Ullmann, Zoran Andelkovic, C. Brandau, A. Dax, W. Geithner , et al. · 2017

Electrons bound in highly charged heavy ions such as hydrogen-like bismuth 209 Bi 82+ experience electromagnetic fields that are a million times stronger than in light atoms. Measuring the wavelength of light emitted and absorbed by these …

THz streak camera method for synchronous arrival time measurement of two-color hard X-ray FEL pulses Open

Ishkhan Gorgisyan, R. Ischebeck, Christian Erny, A. Dax, L. Patthey , et al. · 2017

The two-color operation of free electron laser (FEL) facilities allows the delivery of two FEL pulses with different energies, which opens new possibilities for user experiments. Measuring the arrival time of both FEL pulses relative to th…

Laser spectroscopy of muonic deuterium Open

Randolf Pohl, F. Nez, L. M. P. Fernandes, F. D. Amaro, F. Biraben , et al. · 2016

The deuteron is too small, too The radius of the proton has remained a point of debate ever since the spectroscopy of muonic hydrogen indicated a large discrepancy from the previously accepted value. Pohl et al. add an important clue for s…

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