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Supercontinuous high harmonic generation from asymmetric molecules in the presence of a terahertz field |
| Du Hong-Chuan(杜洪川)a), Wang Hui-Qiao(王慧巧)b), and Hu Bi-Tao(胡碧涛) a)† |
| a School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China; b Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract We have investigated high-order harmonic generation from asymmetric molecules. It is found that supercontinuous high harmonics, which are produced from asymmetric molecules by significantly steering the ionization, are broken down when the electric field of the 5-fs driving laser pulse is increased to 0.16 a.u. The high harmonic generation from asymmetric molecules with the presence of a terahertz field is also investigated. This reveals that the terahertz controlled laser pulse significantly increases the energy difference between photons, emitted from the ejected electrons, in the first and second halves of the optical cycle at the centre of the driving laser pulse. In this way, a 200-eV broadband supercontinuum can be produced in the plateau, from which a 60-as pulse with a bandwidth of 60 eV can be directly obtained with a minor post-pulse.
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Received: 20 August 2010
Revised: 04 January 2011
Accepted manuscript online:
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PACS:
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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32.80.Rm
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(Multiphoton ionization and excitation to highly excited states)
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42.65.Re
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(Ultrafast processes; optical pulse generation and pulse compression)
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| Fund: Project supported by the Program for New Century Excellent Talents in University and the National Natural Science Foundation of China (Grant Nos. 10775062 and 10875054) and the Fundamental Research Funds for the Central Universities (Grant No. lzujbky-2010-k08). |
Cite this article:
Du Hong-Chuan(杜洪川), Wang Hui-Qiao(王慧巧), and Hu Bi-Tao(胡碧涛) Supercontinuous high harmonic generation from asymmetric molecules in the presence of a terahertz field 2011 Chin. Phys. B 20 044207
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