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

Journal Article · Fri Mar 23 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.123904· OSTI ID:20951125

Lytle, A L; Zhang, X; Murnane, M M; Kapteyn, H C; Cohen, O ^[1]; Peatross, J ^[2]

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1. JILA and Department of Physics University of Colorado at Boulder, Boulder, Colorado 80309 (United States)
2. Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602 (United States)

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.

• OSTI ID: 20951125
• Journal Information: Physical Review Letters, Vol. 98, Issue 12; Other Information: DOI: 10.1103/PhysRevLett.98.123904; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COHERENCE LENGTH
GEOMETRY
HARMONIC GENERATION
IONIZATION
LASERS
PHOTONS
PROBES
PULSES
VISIBLE RADIATION
WAVEGUIDES