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@article{Radnor:2008,
author = {Radnor, SBP and Chipperfield, LE and Kinsler, P and New, GHC},
journal = {Physical Review A},
pages = {1--7},
title = {Carrier-wave steepened pulses and gradient-gated high-order harmonic generaiton},
volume = {77},
year = {2008}
}

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TY  - JOUR
AB  - We show how to optimize the process of high-order harmonic generation (HHG) by gating the interaction using the field gradient of the driving pulse.  Since maximized field gradients are efficiently generated by self-steepening processes, we first present a generalized theory of optical carrier-wave self-steepened (CSS) pulses.  This goes beyond existing treatments, which only consider third-order nonlinearity, and has the advantage of describing pulses whose wave forms have a range of symmetry properties.  Although a fertile field for theoretical work, CSS pulses are difficult to realize experimentally because of the deleterious effect of dispersion.  We therefore consider synthesizing CSS-like profiles using a suitably phased subset of the harmonics present in a true CSS wave form.  Using standard models of HHG, we show that the presence of gradient-maximized regions on the wave forms can raise the spectral cutoff and so yield shorter attosecond pulses.  We study how the quality of the attosecond bursts created by spectral filtering depends on the number of harmonics included in the driving pulse.
AU  - Radnor,SBP
AU  - Chipperfield,LE
AU  - Kinsler,P
AU  - New,GHC
EP  - 7
PY  - 2008///
SP  - 1
TI  - Carrier-wave steepened pulses and gradient-gated high-order harmonic generaiton
T2  - Physical Review A
VL  - 77
ER  -

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EMERITUS PROFESSOR GEOFF NEW

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