Supercontinuous high harmonic generation from asymmetric molecules in the presence of a terahertz field |
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| Authors: | Du Hong-Chuan Wang Hui-Qiao and Hu Bi-Tao |
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| Affiliation: | School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China;Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;School of Nuclear Science and Technology, Lanzhou University, 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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| Keywords: | high-order harmonic attosecond pulse supercontinuum |
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