scholarly journals Attosecond pump – attosecond probe spectroscopy of Auger decay

2021 ◽  
Author(s):  
Yoel Kissin ◽  
Marco Ruberti ◽  
Přemysl Kolorenč ◽  
Vitali Averbukh
Keyword(s):  
Harmonic Generation ◽  
Free Electron ◽  
Free Electron Laser ◽  
High Order ◽  
High Order Harmonic Generation ◽  
Auger Decay ◽  
High Order Harmonic ◽  
Probe Spectroscopy

Attosecond pump – attosecond probe spectroscopy is becoming possible due the development of sub-femtosecond free electron laser (FEL) pulses as well as intense high-order harmonic generation-based attosecond sources. Here we...

scholarly journals High-Order-Harmonic Generation and Superradiance in a Seeded Free-Electron Laser

2012 ◽  
Vol 108 (16) ◽  
Author(s):  
L. Giannessi ◽  
M. Artioli ◽  
M. Bellaveglia ◽  
F. Briquez ◽  
E. Chiadroni ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Free Electron ◽  
Free Electron Laser ◽  
High Order ◽  
High Order Harmonic Generation ◽  
High Order Harmonic

scholarly journals Free electron laser seeded by ir laser driven high-order harmonic generation

2007 ◽  
Vol 90 (2) ◽  
pp. 021109 ◽  
Author(s):  
Juhao Wu ◽  
Paul R. Bolton ◽  
James B. Murphy ◽  
Xinming Zhong
Keyword(s):  
Harmonic Generation ◽  
Free Electron ◽  
Free Electron Laser ◽  
High Order ◽  
High Order Harmonic Generation ◽  
High Order Harmonic ◽  
Ir Laser

scholarly journals Stabilization of a high-order harmonic generation seeded extreme ultraviolet free electron laser by time-synchronization control with electro-optic sampling

2015 ◽  
Vol 3 ◽  
Author(s):  
H. Tomizawa ◽  
T. Sato ◽  
K. Ogawa ◽  
K. Togawa ◽  
T. Tanaka ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Free Electron ◽  
Free Electron Laser ◽  
Laser Pulses ◽  
High Order Harmonic Generation ◽  
Electron Bunches ◽  
High Order Harmonic ◽  
Electro Optic ◽  
Seeded Fel ◽  
Arrival Timing

A fully coherent free electron laser (FEL) seeded with a higher-order harmonic (HH) pulse from high-order harmonic generation (HHG) is successfully operated for a sufficiently prolonged time in pilot user experiments by using a timing drift feedback. For HHG-seeded FELs, the seeding laser pulses have to be synchronized with electron bunches. Despite seeded FELs being non-chaotic light sources in principle, external laser-seeded FELs are often unstable in practice because of a timing jitter and a drift between the seeding laser pulses and the accelerated electron bunches. Accordingly, we constructed a relative arrival-timing monitor based on non-invasive electro-optic sampling (EOS). The EOS monitor made uninterrupted shot-to-shot monitoring possible even during the seeded FEL operation. The EOS system was then used for arrival-timing feedback with an adjustability of 100 fs for continual operation of the HHG-seeded FEL. Using the EOS-based beam drift controlling system, the HHG-seeded FEL was operated over half a day with an effective hit rate of 20%–30%. The output pulse energy was $20~{\rm\mu}\text{J}$ at the 61.2 nm wavelength. Towards seeded FELs in the water window region, we investigated our upgrade plan to seed high-power FELs with HH photon energy of 30–100 eV and lase at shorter wavelengths of up to 2 nm through high-gain harmonic generation (HGHG) at the energy-upgraded SPring-8 Compact SASE Source (SCSS) accelerator. We studied a benefit as well as the feasibility of the next HHG-seeded FEL machine with single-stage HGHG with tunability of a lasing wavelength.

scholarly journals High harmonic generation in mixed XUV and NIR fields at a free-electron laser

2021 ◽  
Author(s):  
Jan Troß ◽  
Shashank Pathak ◽  
Adam Summers ◽  
Dimitrios Rompotis ◽  
Benjamin Erk ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Free Electron ◽  
Free Electron Laser ◽  
Near Infrared ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
High Order ◽  
Phase Matching ◽  
Model Calculations ◽  
High Order Harmonic

Abstract We present the results of an experiment investigating the generation of high-order harmonics by a femtosecond near-infrared (NIR) laser pulse in the presence of an extreme ultraviolet (XUV) field provided by a free-electron laser, a process referred to as XUV-assisted high-order harmonic generation (HHG). Our experimental findings show that the XUV field can lead to a small enhancement in the harmonic yield when the XUV and NIR pulses overlap in time, while a strong decrease of the HHG yield and a red shift of the HHG spectrum is observed when the XUV precedes the NIR pulse. The latter observations are in qualitative agreement with model calculations that consider the effect of a decreased number of neutral emitters but are at odds with the predicted effect of the correspondingly increased ionization fraction on the phase matching. Our study demonstrates the technical feasibility of XUV-assisted HHG experiments at free-electron lasers, which may provide new avenues to investigate correlation-driven electron dynamics as well as novel ways to study and control propagation effects and phase matching in HHG.

Relativistic high-order harmonic generation

2003 ◽  
Vol 50 (3-4) ◽  
pp. 375-386
Author(s):  
D. B. MilosÕeviĆ ◽  
W. Becker
Keyword(s):  
Harmonic Generation ◽  
High Order ◽  
High Order Harmonic Generation ◽  
High Order Harmonic
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