scholarly journals Tracing Evolution of Angle-Wavelength Spectrum along the 40-m Postfilament in Corridor Air

Photonics ◽  
2021 ◽  
Vol 8 (10) ◽  
pp. 446
Author(s):  
Daria V. Mokrousova ◽  
Dmitrii V. Pushkarev ◽  
Nikolay A. Panov ◽  
Irina A. Nikolaeva ◽  
Daniil E. Shipilo ◽  
...  

Postfilamentation channel resulting from filamentation of freely propagating 744-nm, 5-mJ, 110-fs pulse in the corridor air is examined experimentally and in simulations. The longitudinal extension of postfilament was determined to be 55–95 m from the compressor output. Using single-shot angle-wavelength spectra measurements, we observed a series of red-shifted maxima in the spectrum, localized on the beam axis with the divergence below 0.5 mrad. In the range 55–70 m, the number of maxima and their red-shift increase with the distance reaching 1 μm, while the pulse duration measured by the autocorrelation technique is approximately constant. Further on, for distances larger than 70 m and up to 95 m, the propagation is characterized by the suppressed beam divergence and unchanged pulse spectrum. The pulse duration increases due to the normal air dispersion.

1989 ◽  
Vol 22 (10) ◽  
pp. 1423-1428 ◽  
Author(s):  
I Buchvarov ◽  
S M Saltiel ◽  
V E Gusev ◽  
V T Platonenko

2018 ◽  
Vol 25 (1) ◽  
pp. 16-19 ◽  
Author(s):  
Jens Rehanek ◽  
Christopher J. Milne ◽  
Jakub Szlachetko ◽  
Joanna Czapla-Masztafiak ◽  
Jörg Schneider ◽  
...  

One of the remaining challenges for accurate photon diagnostics at X-ray free-electron lasers (FELs) is the shot-to-shot, non-destructive, high-resolution characterization of the FEL pulse spectrum at photon energies between 2 keV and 4 keV, the so-called tender X-ray range. Here, a spectrometer setup is reported, based on the von Hamos geometry and using elastic scattering as a fingerprint of the FEL-generated spectrum. It is capable of pulse-to-pulse measurement of the spectrum with an energy resolution (ΔE/E) of 10−4, within a bandwidth of 2%. The Tender X-ray Single-Shot Spectrometer (TXS) will grant to experimental scientists the freedom to measure the spectrum in a single-shot measurement, keeping the transmitted beam undisturbed. It will enable single-shot reconstructions for easier and faster data analysis.


2018 ◽  
Vol 25 (1) ◽  
pp. 26-31 ◽  
Author(s):  
Rosen Ivanov ◽  
Jia Liu ◽  
Günter Brenner ◽  
Maciej Brachmanski ◽  
Stefan Düsterer

The commissioning of a terahertz-field-driven streak camera installed at the free-electron laser (FEL) FLASH at DESY in Hamburg, being able to deliver photon pulse duration as well as arrival time information with ∼10 fs resolution for each single XUV FEL pulse, is reported. Pulse durations between 300 fs and <15 fs have been measured for different FLASH FEL settings. A comparison between the XUV pulse arrival time and the FEL electron bunch arrival time measured at the FLASH linac section exhibits a correlation width of 20 fs r.m.s., thus demonstrating the excellent operation stability of FLASH. In addition, the terahertz-streaking setup was operated simultaneously to an alternative method to determine the FEL pulse duration based on spectral analysis. FLASH pulse duration derived from simple spectral analysis is in good agreement with that from terahertz-streaking measurement.


1989 ◽  
Vol 28 (19) ◽  
pp. 4054 ◽  
Author(s):  
Ian N. Ross ◽  
D. Karadia ◽  
J. M. Barr

2015 ◽  
Vol 48 (20) ◽  
pp. 204004 ◽  
Author(s):  
Katharina Sander ◽  
Christian Peltz ◽  
Charles Varin ◽  
Stefan Scheel ◽  
Thomas Brabec ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document