Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording

Eléonore Roussel; Christophe Szwaj; Clément Evain; Bernd Steffen; Christopher Gerth; Bahram Jalali; Serge Bielawski

doi:10.1038/s41377-021-00696-2

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Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording

Articles

- Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording
- Light: Science & Applications Vol. 11, Issue 1, Pages: 87-100(2022)
- Affiliations：
  
  1.Univ. Lille, CNRS, UMR 8523 - PhLAM - Physique des Lasers, Atomes et Molécules, Centre d'Étude Recherches et Applications (CERLA), F-59000, Lille, France
  2.DESY (Deutsches Elektronen-Synchrotron), Notkestr. 85, D-22607, Hamburg, Germany
  3.Electrical and Computer Engineering Department, University of California, Los Angeles, 420 Westwood Plaza, 90095, Los Angeles, CA, USA
- Author bio：
  
  Serge Bielawski (serge.bielawski@univ-lille.fr)
- Funds：
- DOI：10.1038/s41377-021-00696-2
  CLC：
- Published：31 January 2022，
  
  Published Online：10 January 2022，
  
  Received：27 April 2021，
  
  Revised：17 November 2021，
  
  Accepted：10 December 2021
- Accepted：
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Roussel, E. et al. Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording. Light: Science & Applications, 11, 87-100 (2022).
DOI：

Roussel, E. et al. Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording. Light: Science & Applications, 11, 87-100 (2022). DOI： 10.1038/s41377-021-00696-2.

摘要

Abstract

Recording electric field evolution in single-shot with THz bandwidth is needed in science including spectroscopy

plasmas

biology

chemistry

Free-Electron Lasers

accelerators

and material inspection. However

the potential application range depends on the possibility to achieve sub-picosecond resolution over a long time window

which is a largely open problem for single-shot techniques. To solve this problem

we present a new conceptual approach for the so-called spectral decoding technique

where a chirped laser pulse interacts with a THz signal in a Pockels crystal

and is analyzed using a grating optical spectrum analyzer. By borrowing mathematical concepts from photonic time stretch theory and radio-frequency communication

we deduce a novel dual-output electro-optic sampling system

for which the input THz signal can be numerically retrieved—with unprecedented resolution—using the so-called phase diversity technique. We show numerically and experimentally that this approach enables the recording of THz waveforms in single-shot over much longer durations and/or higher bandwidth than previous spectral decoding techniques. We present and test the proposed DEOS (Diversity Electro-Optic Sampling) design for recording 1.5 THz bandwidth THz pulses

over 20 ps duration

in single-shot. Then we demonstrate the potential of DEOS in accelerator physics by recording

in two successive shots

the shape of 200 fs RMS relativistic electron bunches at European X-FEL

over 10 ps recording windows. The designs presented here can be used directly for accelerator diagnostics

characterization of THz sources

and single-shot Time-Domain Spectroscopy.

关键词

Keywords

references

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