Abstract

The relative intensities of the resonant and nonresonant high-order harmonics, generated by singly charged gallium and indium ions in the field of a laser pulse with a duration of 20 fs and intensity ranging from 5 × 10¹³ to 2 × 10¹⁴ W/cm², are calculated. The harmonic intensity is found via the matrix element of multiphoton transition within the perturbation theory including the resonant contribution. The latter increases the harmonic intensity at the transition from the ground state to the autoionizing state. We consider laser wavelength when this transition corresponds to 7 and 15 photons.

中文翻译：

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多光子电离体系中产生的谐振谐波的强度

摘要

由单电荷的镓和铟离子在持续时间为20 fs，强度范围为5×10 ¹³至2×10 ¹⁴ W / cm的激光脉冲场中产生的谐振和非谐振高次谐波的相对强度²，计算。通过微扰理论中的多光子跃迁的矩阵元素（包括共振贡献）可以找到谐波强度。后者增加了从基态到自电离态过渡时的谐波强度。当此跃迁对应于7和15个光子时，我们考虑激光波长。