N₂⁺ lasing action involves the creation, evolution, and radiation of ions in intense laser fields. In this paper, we demonstrate that N₂⁺ lasing intensity can be enhanced by several times or totally suppressed by controlling the ionic creation and radiation processes through manipulation of the coherent molecular rotational wave packets of N₂ and N₂⁺ with a pump-control scheme. Our results show that if a weak control pulse arrives at the revival moments of the ionic rotational wave packet, the lasing signal can be notably promoted, which is in contrast to observations in previous studies. Meanwhile, the modulation profiles of the lasing signals caused by molecular alignments of N₂ and N₂⁺ are analyzed at length, revealing the double roles of the weak control pulse in inducing molecular alignment of N₂ or monitoring the amplification of the N₂⁺ system by controlling electronic and rotational coherence. Moreover, by performing a Fourier transformation of the delay-dependent N₂⁺ lasing, the rotational wave-packet information of N₂ and N₂⁺ is simultaneously retrieved.
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Xie et al. (2024) studied this question.
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