Carrier-wave steepened pulses and gradient-gated high-order harmonic generation using linear ramp waveforms - Physics > Atomic PhysicsReport as inadecuate




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Abstract: We show how to optimize the process of high-harmonic generation HHG bygating the interaction using the field gradient of a driving pulse with alinear ramp waveform. Since maximized field gradients are efficiently generatedby self-steepening processes, we first present a generalized theory of opticalcarrier-wave self-steepened CSS pulses. This goes beyond existing treatments,which only consider third-order nonlinearity, and has the advantage ofdescribing pulses whose wave forms have a range of symmetry properties.Although a fertile field for theoretical work, CSS pulses are difficult torealize experimentally because of the deleterious effect of dispersion. Wetherefore consider synthesizing CSS-like profiles using a suitably phasedsub-set of the harmonics present in a true CSS wave form. Using standardtheoretical models of HHG, we show that the presence of gradient-maximizedregions on the wave forms can raise the spectral cut-off and so yield shorterattosecond pulses. We study how the quality of the attosecond bursts created byspectral filtering depends on the number of harmonics included in the drivingpulse.



Author: S. B. P. Radnor, L. E. Chipperfield, P. Kinsler, G. H. C. New

Source: https://arxiv.org/







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