Next Article in Journal
Passive Vibration Control of a Semi-Submersible Floating Offshore Wind Turbine
Next Article in Special Issue
Measurement of the X-ray Spectrum of a Free Electron Laser with a Wide-Range High-Resolution Single-Shot Spectrometer
Previous Article in Journal
Effects of Three Different Additives and Two Different Bulk Densities on Maize Silage Characteristics, Temperature Profiles, CO2 and O2–Dynamics in Small Scale Silos during Aerobic Exposure
Previous Article in Special Issue
Fundamental Limits on Spatial Resolution in Ultrafast X-ray Diffraction
Article Menu
Issue 6 (June) cover image

Export Article

Open AccessArticle
Appl. Sci. 2017, 7(6), 544; doi:10.3390/app7060544

Split-And-Delay Unit for FEL Interferometry in the XUV Spectral Range

1
Photon Science Division, Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
2
The Hamburg Centre for Ultrafast Imaging CUI, 22761 Hamburg, Germany
3
Department of Physics, University of Hamburg, 22761 Hamburg, Germany
4
Faculty of Electrical Engineering, Helmut Schmidt University, 22043 Hamburg, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Kiyoshi Ueda
Received: 29 March 2017 / Revised: 5 May 2017 / Accepted: 22 May 2017 / Published: 25 May 2017
(This article belongs to the Special Issue X-Ray Free-Electron Laser)
View Full-Text   |   Download PDF [3108 KB, uploaded 25 May 2017]   |  

Abstract

In this work we present a reflective split-and-delay unit (SDU) developed for interferometric time-resolved experiments utilizing an (extreme ultraviolet) XUV pump–XUV probe scheme with focused free-electron laser beams. The developed SDU overcomes limitations for phase-resolved measurements inherent to conventional two-element split mirrors by a special design using two reflective lamellar gratings. The gratings produce a high-contrast interference signal controlled by the grating displacement in every diffraction order. The orders are separated in the focal plane of the focusing optics, which enables one to avoid phase averaging by spatially selective detection of a single interference state of the two light fields. Interferometry requires a precise relative phase control of the light fields, which presents a challenge at short wavelengths. In our setup the phase delay is determined by an in-vacuum white light interferometer (WLI) that monitors the surface profile of the SDU in real time and thus measures the delay for each laser shot. The precision of the WLI is 1 nm as determined by optical laser interferometry. In the presented experimental geometry it corresponds to a time delay accuracy of 3 as, which enables phase-resolved XUV pump–XUV probe experiments at free-electron laser (FEL) repetition rates up to 60 Hz. View Full-Text
Keywords: white light interferometry; split-and-delay unit; XUV optics characterization; pump-probe white light interferometry; split-and-delay unit; XUV optics characterization; pump-probe
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Usenko, S.; Przystawik, A.; Lazzarino, L.L.; Jakob, M.A.; Jacobs, F.; Becker, C.; Haunhorst, C.; Kip, D.; Laarmann, T. Split-And-Delay Unit for FEL Interferometry in the XUV Spectral Range. Appl. Sci. 2017, 7, 544.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Appl. Sci. EISSN 2076-3417 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top