Laser emission at 126 nm has been obtained from excimers of Ar2 excited electrically in a nozzle discharge followed by supersonic expansion. The direct measurement of light amplification with a tunable VUV probe leads to a gain of >3 cm−1. This high gain arises from efficient population inversion of low vibrational and rotational levels of the excimer state brought about by the supersonic expansion and cooling of the discharge plasma.
© 1989 Optical Society of America
Original Manuscript: March 2, 1989
Manuscript Accepted: April 6, 1989
Published: June 15, 1989
T. Efthimiopoulos, B. P. Stoicheff, and R. I. Thompson, "Efficient population inversion in excimer states by supersonic expansion of discharge plasmas," Opt. Lett. 14, 624-626 (1989)