The stimulated emissions and the collision processes in atomic calcium vapor excited by two photons

Clifford V. Sulham, Greg A. Pitz, Glen P. Perram

D. T. Alimov, A. N. Bel'kovskii, М. Гайсак +2 more

Jin Joong Kim, Nackchin Sung

We have observed, for the first time to our knowledge, stimulated emission in atomic-copper vapor that is excited by a resonant tunable laser beam. One of the important and interesting results obtained in this experiment is that excitation of the (2)P(1/2) level of the copper atoms generates strong amplified spontaneous emission (ASE) for both(2)P(1/2)-(2)D(3/2) and (2)P(3/2)-(2)D(5/2) transitions. This is the first reported direct experimental evidence observed for collisional mixing between the (2)P(1/2) and (2)P(3/2) levels in a copper-vapor laser. Excitation of the (2)P(3/2) level induces substantially weaker ASE for the (2)P(1/2)-(2)D(3/2) transition. In addition, we observed collision-induced ASE for both transitions over a wide range of detuning of the pump frequency. The preliminary results of the experiment are presented, and the implications of the results for high-pressure copper-vapor lasers are discussed.

William H. Pence, S.R. Leone

Ida Maria Catalano, Aldo Cingolani, Michele Ferrara +2 more

Stimulated emission in HgI2 at 80 °K due to an exciton-electron collision cooperative process is reported. The line shape of the stimulated emission band depends on the excitation wavelength. High optical gain has been measured. These effects are observed both with one- and two-photon pumping.

R. Granier, G. Charton, J. Granier