Comparative study of enhancement and suppression of N2+lasing induced by coherent molecular rotational wave packets of N2 and N2+

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.