Research Papers in Physics and Astronomy


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Published in Physical Review Letters 100, 173001 (May 2, 2008). DOI: 10.1103/PhysRevLett.100.173001 Copyright © 2008 The American Physical Society. Used by permission.


Describing harmonic generation (HG) in terms of a system’s complex quasienergy, the harmonic power PΔE(λ) (over a fixed interval, ΔE, of harmonic energies) is shown to reproduce the wavelength scaling predicted recently by two groups of authors based on solutions of the time-dependent Schrödinger equation: PΔE(λ) ~ λx, where x ≈ 5–6. Oscillations of PΔE(λ) on a fine λ scale are then shown to have a quantum origin, involving threshold phenomena within a system of interacting ionization and HG channels, and to be sensitive to the bound state wave function’s symmetry.

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