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- W2242753343 abstract "High Harmonic Generation (HHG) is a fascinatingphenomenon from both fundamental and technological point of view.It enables the generation of attosecond pulses and can haveapplications in EUV lithography and bio-microscopy. HHG can bedescribed by the Three Step Model (TSM), due to the three stages ofthe process: ionization, propagation and recombination. However,HHG suffers from low efficiencies and a study, which shows theefficiency scaling with laser and material parameters is essential.For a long time experimentalists were using only 800 nm driverpulses from Ti:sapphire lasers. With the advent of new lightsources like optical parametric amplifiers, different drivingwavelengths became available and thus the scaling of the singleatom response versus drive wavelength has attracted a lot ofattention. A detailed analysis shows that the efficiency scaleswith w50 at the cutoff and w60 at the plateau region for a fixedEUV frequency, where w0 is the carrier frequency of the driverpulse. To understand the limitations of such a light source, wehave developed a semi-analytic model for the computation of theconversion efficiency into a single harmonic for the plateau andcutoff regions. This model is one-dimensional, uses the TSM for thecalculation of the single atom response and takes laser, materialparameters and macroscopic effects into account. Closed formexpressions for the plateau and cutoff regions are derived and usedto calculate efficiencies for 400 and 800 nm driver pulses. Theresults are compared with experimental ones showing very goodagreement. In order to investigate long-wavelength driven HHGefficiency, the 1-D model is extended to three dimensions takinginto account spatiotemporal propagation effects, such as plasmadefocusing and losses due to electron-neutral inversebremsstrahlung. These phenomena change the phase matching alongpropagation, resulting in non-coherent harmonic generation andconsequently poor efficiencies. We further study ways to mitigatethe effect of plasma defocusing like the use of Supergaussianpulses and the use of Gaussian pulses with larger beam waists. Thework presented can help us develop tools for an optimization studyof HHG efficiency, in order to make useful EUVsources." @default.
- W2242753343 created "2016-06-24" @default.
- W2242753343 creator A5062173464 @default.
- W2242753343 date "2013-01-01" @default.
- W2242753343 modified "2023-09-24" @default.
- W2242753343 title "Limits of High Harmonic Generation conversion efficiency" @default.
- W2242753343 hasPublicationYear "2013" @default.
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