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This content will become publicly available on March 12, 2019

Title: Spatiotemporal control of laser intensity

The controlled coupling of a laser to a plasma has the potential to address grand scientific challenges including reaching the Schwinger limit, developing compact free electron lasers, extending linear colliders to TeV energies, and generating novel light sources for probing electron dynamics within molecules. Currently, many such applications have limited flexibility and poor control over the laser focal volume. Here we present an advanced focusing scheme called a “flying focus” where a chromatic focusing system combined with chirped laser pulses enables a small–diameter laser focus to propagate nearly 100 times its Rayleigh length, while decoupling the speed at which the peak intensity moves from its group velocity. This unprecedented spatiotemporal control over the laser focal volume allows the laser focus to co- or counter–propagate along its axis at any velocity. Experiments validating the concept measured subluminal (-0.09c) to superluminal (39c) focal spot velocities generating a nearly constant peak intensity over 4.5 mm.
Authors:
ORCiD logo [1] ;  [2] ;  [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [1] ;  [2] ;  [2]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Univ. of Rochester, NY (United States). Dept. of Physics
  2. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Report Number(s):
2017-173; 13-98
Journal ID: ISSN 1749-4885; PII: 121
Grant/Contract Number:
NA0001944; SC0016253
Type:
Accepted Manuscript
Journal Name:
Nature Photonics
Additional Journal Information:
Journal Volume: 12; Journal Issue: 5; Journal ID: ISSN 1749-4885
Publisher:
Nature Publishing Group
Research Org:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1437582