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Harmonic generation at high field strengths - Frequency shifts and saturation phenomenaOptical harmonic generation and mixing in the gas phase has been proposed as a technique for the generation of coherent radiation in the vacuum ultraviolet and soft X-ray spectral region. At the high field strengths required by these processes the interaction between atoms and the electromagnetic field shows intensity-dependent resonances. In this paper we modify harmonic generation theory to include the effect of these frequency shifts. Closed-form expressions for generated dipole moment, absorption probability, and coherence length are presented. The most important consequences of frequency shifts on resonantly enhanced processes are that the pump laser must be tuned away from the small-field resonance frequency, that the conversion efficiency may saturate, and that the dispersion of the medium may change sign. As an example, the generation of 198-A radiation by a five-photon mixing process in Li(+) is considered.
Document ID
19750047423
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Stappaerts, E. A.
(Stanford University Stanford, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
May 1, 1975
Publication Information
Publication: Physical Review A - General Physics
Subject Category
Nuclear And High-Energy Physics
Accession Number
75A31495
Distribution Limits
Public
Copyright
Other

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