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Title: Pump-Probe Ghost Imaging with SASE FELs

Abstract

In this study, we propose a new approach to measuring ultrafast dynamics with free-electron lasers (FELs). Ultrafast experiments are among the most promising avenues of research at x-ray FELs, with the potential to reveal the chemical dynamics of charge separation, conical intersection crossing, and biologically mediated reactions. Pump-probe scanning is the standard approach to measure dynamics at x-ray FELs, but at the shortest timescales, and particularly for x-ray pump, x-ray probe experiments, the scans require challenging beam setups and can introduce systematic errors. Here, we propose an alternative approach using the randomness of the self-amplified spontaneous emission (SASE) process to drive many simultaneous pump-probe experiments on each shot. Measuring the fluctuations in the incident beam’s time profile on a shot-to-shot basis enables the reconstruction of ultrafast dynamics down to the coherence length of the FEL without the need for pump-probe scans. Because of similarity to ghost imaging, in which spatial properties are reconstructed by measuring the incident probe’s transverse properties, we call this “pump-probe ghost imaging.” In this paper, we describe the method and simulate an example experiment. We also describe an alternative implementation that uses only spectral measurements, avoiding the need for direct time-domain diagnostics and extending the methodmore » to the attosecond regime.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1498815
Alternate Identifier(s):
OSTI ID: 1504491
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Name: Physical Review. X Journal Volume: 9 Journal Issue: 1; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Ratner, D., Cryan, J. P., Lane, T. J., Li, S., and Stupakov, G. Pump-Probe Ghost Imaging with SASE FELs. United States: N. p., 2019. Web. doi:10.1103/PhysRevX.9.011045.
Ratner, D., Cryan, J. P., Lane, T. J., Li, S., & Stupakov, G. Pump-Probe Ghost Imaging with SASE FELs. United States. doi:https://doi.org/10.1103/PhysRevX.9.011045
Ratner, D., Cryan, J. P., Lane, T. J., Li, S., and Stupakov, G. Mon . "Pump-Probe Ghost Imaging with SASE FELs". United States. doi:https://doi.org/10.1103/PhysRevX.9.011045.
@article{osti_1498815,
title = {Pump-Probe Ghost Imaging with SASE FELs},
author = {Ratner, D. and Cryan, J. P. and Lane, T. J. and Li, S. and Stupakov, G.},
abstractNote = {In this study, we propose a new approach to measuring ultrafast dynamics with free-electron lasers (FELs). Ultrafast experiments are among the most promising avenues of research at x-ray FELs, with the potential to reveal the chemical dynamics of charge separation, conical intersection crossing, and biologically mediated reactions. Pump-probe scanning is the standard approach to measure dynamics at x-ray FELs, but at the shortest timescales, and particularly for x-ray pump, x-ray probe experiments, the scans require challenging beam setups and can introduce systematic errors. Here, we propose an alternative approach using the randomness of the self-amplified spontaneous emission (SASE) process to drive many simultaneous pump-probe experiments on each shot. Measuring the fluctuations in the incident beam’s time profile on a shot-to-shot basis enables the reconstruction of ultrafast dynamics down to the coherence length of the FEL without the need for pump-probe scans. Because of similarity to ghost imaging, in which spatial properties are reconstructed by measuring the incident probe’s transverse properties, we call this “pump-probe ghost imaging.” In this paper, we describe the method and simulate an example experiment. We also describe an alternative implementation that uses only spectral measurements, avoiding the need for direct time-domain diagnostics and extending the method to the attosecond regime.},
doi = {10.1103/PhysRevX.9.011045},
journal = {Physical Review. X},
number = 1,
volume = 9,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: https://doi.org/10.1103/PhysRevX.9.011045

Citation Metrics:
Cited by: 6 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) The simplest realization with a single SASE pulse: Photons separated by different delays (e.g., τ1, τ2, and τ3) effectively drive independent pump-probe experiments within the same pulse. (b) More complicated setups are also possible, for example, pumping with one wavelength (red dashed line) and probing with anothermore » (blue solid line). In both cases, the temporal resolution of the reconstruction is determined by the spike width or measurement resolution and not the pulse duration as in a traditional pump-probe setup.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.