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We report on generation of a rotational wavepacket in the ground vibronicstate (v = 0) of excited electronic B2{\Sigma}u+ state of N2+ in a femtosecondlaser induced plasma spark. Decoding of the rotational wavepacket is achievedwith the frequency-resolved seed-amplified air laser spectrum resulting fromthe population inversion between the B2{\Sigma}u+-X2{\Sigma}g+ states of N2+ inthe plasma. We also observe that the rotational wave-packet leads to modulationof the amplified seed signals in the time domain using a pump-probe scheme,which can be well reproduced by theoretical calculation. Our resultsdemonstrate that the air laser provides an ideal probe for remotecharacterization of molecular rotational states distribution in a femtosecondlaser induced filament.

Reconstruction of a Rotational Wavepacket of Inverted Molecular Ions in an Intense Femtosecond Laser Field