Probe of High-Order Harmonic Generation in a Hollow Waveguide Geometry using Counterpropagating Light

A. L. Lytle, X. Zhang, J. Peatross, M. M. Murnane, H. C. Kapteyn, and O. Cohen
Phys. Rev. Lett. 98, 123904 – Published 23 March 2007

Abstract

We use counterpropagating light to directly observe the coherent buildup of high harmonic generation in a hollow waveguide geometry. We measure, for the first time, coherence lengths for high photon energies that cannot be phase matched using conventional approaches. We also probe the transition through phase matching, the ionization level at which different harmonic orders are generated, and the change in the coherence length as the driving laser is depleted. These results directly prescribe the optimal structures or pulse trains required for implementing quasiphase matching.

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  • Received 19 September 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.123904

©2007 American Physical Society

Authors & Affiliations

A. L. Lytle1,*, X. Zhang1, J. Peatross2, M. M. Murnane1, H. C. Kapteyn1, and O. Cohen1

  • 1JILA and Department of Physics University of Colorado at Boulder, Boulder, Colorado 80309 USA
  • 2Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA

  • *Email address: lytle@colorado.edu

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Issue

Vol. 98, Iss. 12 — 23 March 2007

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