P.P. Sorokin, J.R. Lankard, et al.
Applied Physics Letters
Infrared laser action in helium-buffered Sr vapor, resulting from the combined effects of optical pumping and inelastic collisions, has been observed at 2.923, 2.692, and 2.602 μ. A dye laser was used for pumping. © 1969 The American Physical Society.
P.P. Sorokin, J.R. Lankard, et al.
Applied Physics Letters
J.H. Glownia, G. Arjavalingam, et al.
The Journal of Chemical Physics
Ph. Avouris, D.S. Bethune, et al.
Journal of Photochemistry
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Optics Letters