Gain Measurements on the Sequence Bands in a TEA-CO2 Amplifier.

摘要

After having measured small-signal gains as high as 1.5% cm-1 in a TEA CO2 amplifier on the 00 2-(10 1, 02 1) sequence bands, the authors have concluded that the ratio of the gain coefficient of the sequence bands over that of the regular bands was independent of either the CO2 or He proportion in the gas mixture. This ratio rather increases with the electrical energy dumped into the active medium to reach a value of 1/3 at an excitation density of 140 J/lambda. Due to the relatively high gain of the sequence bands, it should be possible to have standard TEA CO2 lasers emit at frequencies where the atmospheric transmission at sea level is higher than at the regular emission frequencies. Furthermore, gain on the sequence bands was responsible for the anomalously high-gain coefficient measured at low J values of the R branch of the regular 9.4-micrometer transition in TEA amplifiers. (Author)