Article

Harmonic generation by an intense laser pulse in neutral and ionized gases

X. LiuCenter for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI, USAD. UmstadterCenter for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI, USAE. EsareyBeam Physics Branch, Naval Research Laboratory, Inc., Washington D.C., DC, USAA. TingBeam Physics Branch, Naval Research Laboratory, Inc., Washington D.C., DC, USA

1993en

ABI

Abstract

Reported are the results of a harmonic generation experiment in a simple gas (hydrogen) using 1-ps, 1- mu m laser pulses with a range of intensities extending from below to far above the laser ionization saturation threshold. The scaling with intensity above saturation of the third harmonic generated by a single laser-pulse in a filled gas cell is observed not to fit with a simple model that takes into consideration volume ionization effects alone. In another experiment, a pump-probe type, an upper limit on the conversion efficiency of third-harmonic generation in a preformed plasma is determined. It is found to be in agreement with the efficiency predicted by a relativistic harmonic generation theory.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>

Identifiers

DOI: 10.1109/27.221106

Citations and references

Cited by 20 references

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