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Title: Pump-probe ghost imaging with SASE FELs

Abstract

In this paper 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 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 time scales, 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 reconstruction of ultrafast dynamics down to the coherence length of the FEL without the need for pump-probe scans. Due to 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" (PPGI). 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)
OSTI Identifier:
1495034
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Program Document
Country of Publication:
United States
Language:
English

Citation Formats

Ratner, Daniel Fried. Pump-probe ghost imaging with SASE FELs. United States: N. p., 2019. Web.
Ratner, Daniel Fried. Pump-probe ghost imaging with SASE FELs. United States.
Ratner, Daniel Fried. Tue . "Pump-probe ghost imaging with SASE FELs". United States. https://www.osti.gov/servlets/purl/1495034.
@article{osti_1495034,
title = {Pump-probe ghost imaging with SASE FELs},
author = {Ratner, Daniel Fried},
abstractNote = {In this paper 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 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 time scales, 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 reconstruction of ultrafast dynamics down to the coherence length of the FEL without the need for pump-probe scans. Due to 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" (PPGI). 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 = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {1}
}

Program Document:
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