By P. B. Corkum (auth.), Luis Plaja, Ricardo Torres, Amelle Zaïr (eds.)
Attophysics is an rising box in physics dedicated to the learn and characterization of topic dynamics within the sub-femtosecond time scale. This publication provides insurance of a wide set of chosen subject matters during this box, fascinating by means of their novelty and their capability influence. The e-book is written review-like. it is usually basic chapters as advent to the sector for non-specialist physicists. The e-book is based in 4 sections: fundamentals, attosecond pulse know-how, functions to measurements and keep watch over of actual methods and destiny views. it's a worthy reference instrument for researchers within the box in addition to a concise creation to non-specialist readers.
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Additional info for Attosecond Physics: Attosecond Measurements and Control of Physical Systems
It thereby also becomes a time-limit on the duration over which XUV radiation is absorbed in the calculation, which in turn gives rise to a minimum spectral bandwidth of absorption lines in the XUV spectrum. For details see . The second term is due to the ionization of the medium and is calculated from the time-dependent 2 (t) current density J (t) = ∂Pion so that − ωc2 P˜ion (ω) = FT[ 1c2 ∂J∂t(t) ] : ∂t 0 ∂J (t) e2 Ne (t) = E1 (t). 27) Ne (t) = [1 − [1 − pion (t)]2 ]Na (t) is the time-dependent electron density for an atom with two m = 0 electrons, and pion (t) is the one-electron ionization probability calculated from the spatial distribution of the one-electron wave function as described in Sect.
However, in the regime of interest for generation of harmonics and attosecond pulses, both the laser and the XUV radiation is strongly phase matched in the forward direction and one can in general safely ignore the backward propagating light. This is often done by transforming to a coordinate system that moves at the group velocity vg of the pulse, z = z, t = t − z/vg and applying the so-called slowly evolving wave approximation (SEWA) in which one assumes that the laser and XUV light changes slowly in the propagation direction compared to the wavelength (see ) for details.
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