Contribution of HOMO-1 to the high-order harmonic generation by a two-component laser field

被引:0
作者
Habibovic, D. [1 ,3 ]
Milosevic, D. B. [1 ,2 ]
机构
[1] Univ Sarajevo, Fac Sci, Sarajevo, Bosnia & Herceg
[2] Acad Sci & Arts Bosnia & Herzegovina, Dept Nat & Math Sci, Sarajevo, Bosnia & Herceg
[3] Univ Sarajevo, Fac Sci, Zmaja Od Bosne 35, Sarajevo 71000, Bosnia & Herceg
关键词
High-order harmonic generation; molecular orbitals; interferences; RADIATION; EMISSION; DYNAMICS; ATOMS;
D O I
10.1080/09500340.2024.2341636
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The contributions of two energetically highest molecular orbitals to the harmonic emission rate are analysed for a two-component laser field. For diatomic molecules exposed to the elliptically polarised field, the emission from the highest-occupied molecular orbital (HOMO) is dominant for various molecular orientations with respect to the laser field. However, the contribution of the lower molecular orbital (HOMO-1) can become significant or even dominant for some molecular orientations. We introduce the ratio of the coherent over the incoherent sum of the HOMO and HOMO-1 contributions as a quantitative measure of the significance of the particular molecular orbital. Also, the gaseous medium response is different for the left and right elliptically polarised light and the molecular characteristics are imprinted into this difference. Moreover, for the orthogonally polarised two-colour (OTC) laser field the relative contributions of HOMO and HOMO-1 depend to a great extent on the relative phase between the field components. The importance of the HOMO-1 can be assessed by the relative error which is made if the harmonic spectra are obtained only with the HOMO contribution. Finally, we investigate the interference of the contributions of two highest molecular orbitals. We show that, for the OTC field, the destructive interference depends linearly on the intensity of the field components. Also, the interference minima shift towards the higher energies with the increase of the component wavelength.
引用
收藏
页码:780 / 791
页数:12
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