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Photon Acceleration in a Flying Focus.

A J Howard1, D Turnbull1, A S Davies1

  • 1University of Rochester, Laboratory for Laser Energetics, Rochester 14623, New York, USA.

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|October 22, 2019
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Summary
This summary is machine-generated.

A novel flying focus technique overcomes limitations in laser-driven frequency upshifts. This method enables extreme ultraviolet generation from ultrashort optical pulses, paving the way for tabletop coherent X-ray sources.

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Area of Science:

  • Laser Physics
  • Plasma Physics
  • Nonlinear Optics

Background:

  • High-intensity laser pulses interacting with media generate ionization fronts.
  • These fronts can accelerate and frequency upshift photons in a second pulse.
  • Limitations include photon dephasing and pulse refraction in plasma.

Purpose of the Study:

  • To overcome limitations in laser-driven photon frequency upshifts.
  • To demonstrate extreme ultraviolet (XUV) generation using a flying focus.
  • To explore the potential for novel tabletop coherent X-ray sources.

Main Methods:

  • Utilizing a flying focus, generated by a chirped laser pulse and a chromatic lens.
  • Employing theoretical analysis and numerical simulations.
  • Investigating the interaction of a flying focus-generated ionization front with an ultrashort optical pulse.

Main Results:

  • The flying focus successfully generated an ionization front capable of significant frequency upshifting.
  • Ultrashort optical pulses were upshifted to the extreme ultraviolet (XUV) over centimeter-scale propagation.
  • The scheme demonstrated potential for overcoming previous limitations in photon acceleration and frequency conversion.

Conclusions:

  • The flying focus technique effectively overcomes limitations in laser-driven frequency upshifts.
  • This approach enables efficient generation of extreme ultraviolet radiation.
  • The findings suggest a scalable pathway towards novel tabletop sources of spatially coherent X-rays.