scholarly journals Polarization control with an X-ray phase retarder for high-time-resolution pump–probe experiments at SACLA

2019 ◽  
Vol 26 (4) ◽  
pp. 1139-1143 ◽  
Author(s):  
Y. Kubota ◽  
M. Suzuki ◽  
T. Katayama ◽  
K. Yamamoto ◽  
K. Tono ◽  
...  
Keyword(s):  
Circular Polarization ◽  
Time Resolution ◽  
Free Electron ◽  
Free Electron Laser ◽  
Dynamical Theory ◽  
High Time Resolution ◽  
Pump Probe ◽  
X Ray ◽  
Polarization Control ◽  
High Degree

Control of the polarization of an X-ray free-electron laser (XFEL) has been performed using an X-ray phase retarder (XPR) in combination with an arrival timing diagnostic on BL3 of the SPring-8 Angstrom Compact free-electron LAser (SACLA). To combine with the timing diagnostic, a pink beam was incident on the XPR crystal and then monochromated in the vicinity of samples. A high degree of circular polarization of ∼97% was obtained experimentally at 11.567 keV, which agreed with calculations based on the dynamical theory of X-ray diffraction. This system enables pump–probe experiments to be operated using circular polarization with a time resolution of 40 fs to investigate ultrafast magnetic phenomena.

Polarization control of an X-ray free-electron laser with a diamond phase retarder

2014 ◽  
Vol 21 (3) ◽  
pp. 466-472 ◽  
Author(s):  
Motohiro Suzuki ◽  
Yuichi Inubushi ◽  
Makina Yabashi ◽  
Tetsuya Ishikawa
Keyword(s):  
Circular Polarization ◽  
Free Electron ◽  
Free Electron Laser ◽  
X Rays ◽  
Horizontal Polarization ◽  
X Ray ◽  
Polarization Control ◽  
Diamond Phase ◽  
Thick Crystal ◽  
High Degree

A diamond phase retarder was applied to control the polarization states of a hard X-ray free-electron laser (XFEL) in the photon energy range 5–20 keV. The horizontal polarization of the XFEL beam generated from the planar undulators of the SPring-8 Angstrom Compact Free-Electron Laser (SACLA) was converted into vertical or circular polarization of either helicity by adjusting the angular offset of the diamond crystal from the exact Bragg condition. Using a 1.5 mm-thick crystal, a high degree of circular polarization, 97%, was obtained for 11.56 keV monochromatic X-rays, whereas the degree of vertical polarization was 67%, both of which agreed with the estimations including the energy bandwidth of the Si 111 beamline monochromator.

scholarly journals Double chirp-taper x-ray free-electron laser for attosecond pump-probe experiments

2019 ◽  
Vol 22 (5) ◽  
Author(s):  
Zhen Zhang ◽  
Joseph Duris ◽  
James P. MacArthur ◽  
Zhirong Huang ◽  
Agostino Marinelli
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Pump Probe ◽  
X Ray

scholarly journals Demonstration of Transmission Mode Soft X-ray NEXAFS Using Third- and Fifth-Order Harmonics of FEL Radiation at SACLA BL1

2020 ◽  
Vol 10 (21) ◽  
pp. 7852
Author(s):  
Hiroshi Iwayama ◽  
Masanari Nagasaka ◽  
Ichiro Inoue ◽  
Shigeki Owada ◽  
Makina Yabashi ◽  
...  
Keyword(s):  
Fine Structure ◽  
Free Electron ◽  
Free Electron Laser ◽  
Transmission Mode ◽  
Pump Probe ◽  
X Ray ◽  
The Third ◽  
Nexafs Spectroscopy ◽  
Fifth Order ◽  
X Ray Absorption

We demonstrate the applicability of third- and fifth-order harmonics of free-electron laser (FEL) radiation for soft X-ray absorption spectroscopy in the transmission mode at SACLA BL1, which covers a photon energy range of 20 to 150 eV in the fundamental FEL radiation. By using the third- and fifth-order harmonics of the FEL radiation, we successfully recorded near-edge X-ray absorption fine structure (NEXAFS) spectra for Ar 2p core ionization and CO2 C 1s and O 1s core ionizations. Our results show that the utilization of third- and fifth-order harmonics can significantly extend the available photon energies for NEXAFS spectroscopy using an FEL and opens the door to femtosecond pump-probe NEXAFS using a soft X-ray FEL.

scholarly journals Pump-Probe Time-Resolved Serial Femtosecond Crystallography at SACLA: Current Status and Data Collection Strategies

2019 ◽  
Vol 9 (24) ◽  
pp. 5505 ◽  
Author(s):  
Eriko Nango ◽  
Minoru Kubo ◽  
Kensuke Tono ◽  
So Iwata
Keyword(s):  
Data Collection ◽  
Free Electron ◽  
Free Electron Laser ◽  
Current Status ◽  
Optical Pump ◽  
Time Resolved ◽  
Pump Probe ◽  
X Ray ◽  
Collection Strategies ◽  
Serial Femtosecond Crystallography

Structural information on protein dynamics is a critical factor in fully understanding the protein functions. Pump-probe time-resolved serial femtosecond crystallography (TR-SFX) is a recently established technique for visualizing the structural changes or reactions in proteins that are at work with high spatial and temporal resolution. In the pump-probe method, protein microcrystals are continuously delivered from an injector and exposed to an X-ray free-electron laser (XFEL) pulse after a trigger to initiate a reaction, such as light, chemicals, temperature, and electric field, which affords the structural snapshots of intermediates that occur in the protein. We are in the process of developing the device and techniques for pump-probe TR-SFX while using XFEL produced at SPring-8 Angstrom Compact Free-Electron Laser (SACLA). In this paper, we described our current development details and data collection strategies for the optical pump X-ray probe TR-SFX experiment at SACLA and then reported the techniques of in crystallo TR spectroscopy, which is useful in clarifying the nature of reaction that takes place in crystals in advance.

scholarly journals Approach of Serial Crystallography II

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 655
Author(s):  
Ki-Hyun Nam
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Cryogenic Temperature ◽  
Research Trends ◽  
Special Issue ◽  
Time Resolved ◽  
Pump Probe ◽  
X Ray ◽  
Fluctuation Dynamics ◽  
Serial Crystallography

Serial crystallography (SX) is an emerging X-ray crystallographic method for determining macromolecule structures. It can address concerns regarding the limitations of data collected by conventional crystallography techniques, which require cryogenic-temperature environments and allow crystals to accumulate radiation damage. Time-resolved SX studies using the pump-probe methodology provide useful information for understanding macromolecular mechanisms and structure fluctuation dynamics. This Special Issue deals with the serial crystallography approach using an X-ray free electron laser (XFEL) and synchrotron X-ray source, and reviews recent SX research involving synchrotron use. These reports provide insights into future serial crystallography research trends and approaches.

scholarly journals Polarization control in an X-ray free-electron laser

2016 ◽  
Vol 10 (7) ◽  
pp. 468-472 ◽  
Author(s):  
Alberto A. Lutman ◽  
James P. MacArthur ◽  
Markus Ilchen ◽  
Anton O. Lindahl ◽  
Jens Buck ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
X Ray ◽  
Polarization Control

Pump-probe laser development for the European X-ray Free-Electron Laser facility

2012 ◽  
Author(s):  
Max J. Lederer ◽  
Mikhail Pergament ◽  
Martin Kellert ◽  
Cruz Mendez
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Probe Laser ◽  
Pump Probe ◽  
X Ray ◽  
Laser Facility ◽  
Laser Development

Ultrafast pump-probe laser for the European X-ray free-electron laser facility

2016 ◽  
Author(s):  
M. J. Lederer ◽  
M. Pergament ◽  
M. Kellert ◽  
K. Kruse ◽  
J. Wang ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Probe Laser ◽  
Pump Probe ◽  
X Ray ◽  
Laser Facility

scholarly journals Parallel Broadband Femtosecond Reflection Spectroscopy at a Soft X-Ray Free-Electron Laser

2020 ◽  
Vol 10 (19) ◽  
pp. 6947
Author(s):  
Robin Y. Engel ◽  
Piter S. Miedema ◽  
Diego Turenne ◽  
Igor Vaskivskyi ◽  
Günter Brenner ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
High Sensitivity ◽  
High Spectral Resolution ◽  
Specific Information ◽  
Pump Probe ◽  
Third Harmonic ◽  
X Ray ◽  
Transmission Grating ◽  
Spectrally Resolved

X-ray absorption spectroscopy (XAS) and the directly linked X-ray reflectivity near absorption edges yield a wealth of specific information on the electronic structure around the resonantly addressed element. Observing the dynamic response of complex materials to optical excitations in pump–probe experiments requires high sensitivity to small changes in the spectra which in turn necessitates the brilliance of free electron laser (FEL) pulses. However, due to the fluctuating spectral content of pulses generated by self-amplified spontaneous emission (SASE), FEL experiments often struggle to reach the full sensitivity and time-resolution that FELs can in principle enable. Here, we implement a setup which solves two common challenges in this type of spectroscopy using FELs: First, we achieve a high spectral resolution by using a spectrometer downstream of the sample instead of a monochromator upstream of the sample. Thus, the full FEL bandwidth contributes to the measurement at the same time, and the FEL pulse duration is not elongated by a monochromator. Second, the FEL beam is divided into identical copies by a transmission grating beam splitter so that two spectra from separate spots on the sample (or from the sample and known reference) can be recorded in-parallel with the same spectrometer, enabling a spectrally resolved intensity normalization of pulse fluctuations in pump–probe scenarios. We analyze the capabilities of this setup around the oxygen K- and nickel L-edges recorded with third harmonic radiation of the free electron laser in Hamburg (FLASH), demonstrating the capability for pump–probe measurements with sensitivity to reflectivity changes on the per mill level.

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