Focus conditioning effects on molecular field-free alignment observed with high-order harmonic generation |
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Authors: | Jiajun Wu and Pengfei Wei |
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Affiliation: | 1,21College of Physics and Electronic Information Engineering,Wenzhou University,Wenzhou 325035,China2Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China |
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Abstract: | We investigate the focus conditioning effects on molecular field-free alignment observed with high-order harmonic generation (HHG) from CO2 molecules. We also experimentally demonstrate that both the spectral shape and alignment signal of HHG significantly vary with changing focus position. A maximal alignment signal is achieved at a given focus position because of the optimal intensity of the driving laser. This intensity is related to the ionization potential of the molecules. These results indicate that a unique focus position provides an optimal alignment signal for practical applications. |
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