Abstract
Cavity-free lasing of ${\rm N}_2^ +$ induced by a femtosecond laser pulse at 800 nm is nearly totally suppressed by a delayed twin control pulse. We explain this surprising effect within the V-scheme of lasing without population inversion. A fast transfer of population between nitrogen ionic states ${{\rm X}^2}\Sigma _g^ +$ and ${{\rm A}^2}{\Pi _u}$, induced by the second pulse, terminates the conditions for amplification in the system. The appearance of short lasing bursts at delays corresponding to revivals of rotational wave packets is explained along the same lines.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Zheng Li, Yu-Hung Kuan, Xiangxu Mu, Zhiming Miao, Chengyin Wu, and Wen-Te Liao
Opt. Lett. 45(24) 6587-6590 (2020)
Rostyslav Danylo, Guillaume Lambert, Yi Liu, Vladimir Tikhonchuk, Aurélien Houard, and André Mysyrowicz
Opt. Lett. 46(6) 1253-1256 (2021)
Xiaodong Zhao, Stefan Nolte, and Roland Ackermann
Opt. Lett. 45(13) 3661-3664 (2020)