Measurement of rotational temperature in CO2 waveguide laser medium

Kinetic modeling of a slow flow CW CO2 laser

“…So, here the 10P(18) line assumed to have most oscillation gain among the other lines and be able to overcome in oscillation. This is consistent with the value was reported in Suzuki et al (1988). Figure 7 gives the laser output power variation with the optical loss coefficient, the loss being defined by the absorption, scattering and deflection of photons in the resonator.…”

“…According to Suzuki et al (1988) the energy U transferred through the separating layer is determined by the following expression…”

Influence of Reactant Structure and Secondary Reactions on H2O 010/000 Vibrational Populations Produced via OH + Cycloalkanes

“…In our previous report, a simple Boltzmann plot was used to obtain a higher (500 ± 200 K) estimate of the rotational temperature.6 Using those data in the gain coefficient model, which properly accounts for the nuclear spin state statistics as well as upper state rotational populations, leads to a rotational temperature of 300 K. This is consistent with the approximately roomtemperature Boltzmann distributions observed for ordinary CO2 lasers which utilize low gas pressures and low energy excitations. 41 The assumption of a room temperature Boltzmann distribution for H2O rotational state populations, in 1.6 Torr of Ar, has been recently made for modeling H2O elimination from chemically activated ethanol. 42 The question of whether or not the rotational populations can be described by a Boltzmann distribution is important in evaluating the mechanisms responsible for producing population inversions in pulsed-excitation water vapor lasers.17b The gain coefficient model would provide a means of testing the observed gains against a statistical distribution of rotational state populations of the observed rotational-vibrational H2O laser lines.…”