2024-03-29T02:37:11Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/959302016-02-17T22:42:45Zcom_10261_115com_10261_3col_10261_368
2014-04-28T09:03:12Z
urn:hdl:10261/95930
Femtosecond laser pulse shaping for enhanced ionization
Castro, Alberto
Räsänen, E.
Rubio, Angel
Gross, E. K. U.
El pdf del artículo es la versión post-print: arXiv:0906.1938v1
We demonstrate how the shape of femtosecond laser pulses can be tailored in order to obtain maximal ionization of atoms or molecules. For that purpose, we have overlayed a direct-optimization scheme on top of a fully unconstrained computation of the three-dimensional time-dependent Schrödinger equation. The procedure looks for pulses that maintain the same total length and integrated intensity or fluence as a given pulse that serves as an initial guess. It allows, however, for changes in frequencies —within a certain, predefined range— and overall shape, leading to enhanced ionization. We illustrate the scheme by calculating ionization yields for the H2+ molecule when irradiated with short (≈5 fs), high-intensity laser pulses. The magnitude of the obtained enhancement, as well as the shape of the solution optimal field depend strongly on the constrains imposed on the search space. In particular, when only small frequencies are allowed, the solution merely increases the peak intensity through temporal compression, as expected from a simple tunneling picture. If larger frequencies are allowed the structure of the solution field is more complicated.
2014-04-28T09:03:12Z
2014-04-28T09:03:12Z
2009
artículo
EPL 87(5): 53001 (2009)
0295-5075
http://hdl.handle.net/10261/95930
10.1209/0295-5075/87/53001
1286-4854
eng
Postprint
http://dx.doi.org/10.1209/0295-5075/87/53001
info:eu-repo/grantAgreement/EC/FP7/211956
openAccess
Institute of Physics Publishing