Abstract
We experimentally demonstrate N2+ lasing actions at the wavelengths of 353.3,
353.8, and 354.9 nm using a circularly polarized femtosecond laser. The three laser
lines correspond to the B2?u+(v?=5,4,3)?X2?g+(v=4,3,2)
transitions, respectively. Particularly, we reveal the pressure-dependent gain dynamics
of these lasing actions from highly excited vibrational states with a pump–probe scheme.
Our experimental results confirm that electron collisional excitation plays an important
role in the establishment of a population inversion of N2+ lasing at these
wavelengths.
© 2015 Chinese Laser Press
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