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Even-harmonic generation due to spatially asymmetric emission | | H. Ahmadi
; M. Vafaee
; A. Maghari
; | | Date: |
2 Mar 2016 | | Abstract: | Generation of even-order harmonics due to spatial symmetry breaking in
high-order harmonic generation investigated by numerically solving
one-dimensional electronic time-dependent Schr"{o}dinger equation beyond the
Born-Oppenheimer approximation. The simple molecular ions H$_2^+$ and T$_2^+$
is chosen under a 14-cycle trapezoidal laser pulse at 800 nm wavelength and
$I=$3 $ imes 10^{14}$ Wcm$^{-2}$ intensity.
For an isotope (H$_2^+$) that has not a significant HHG at the laser falling
edge, only odd harmonic orders are observed. Whereas, for one (T$_2^+$) with
considerable HHG at the falling part of the laser pulse, frequency redshift
occurs for odd-order harmonics and also even harmonic orders appear as a result
of spatial symmetry breaking. To clarify further, spatial distribution of HHG
and resolving HHG into different components are demonstrated. The contribution
of different electronic states to the complexities in terms of internuclear
distance is also demonstrated. The results also help to understand better
complicated features observed for even a non-trapezoidal laser pulse and even a
multi-electron molecular system. | | Source: | arXiv, 1603.0767 | | Services: | Forum | Review | PDF | Favorites | |
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