Laser oscillation at 2054 cm-1 has been observed from a vibrational transition of the CN- molecule doped into KBr host crystals. At sufficiently large CN- concentrations, population inversion between the ν = 2 and ν= 1 vibrational levels is created by optical pumping of the 0 → 1 transition followed by an efficient vibrational-energy exchange process.
© 1984 Optical Society of America
W. Tkach, T. R. Gosnell, and A. J. Sievers, "Solid-state vibrational laser—KBr:CN-," Opt. Lett. 9, 122-124 (1984)