Analysis of the dynamics of a mechanical Q-switched CO2 laser: Six-temperature model

Abstract

A six-temperature kinetic model for a CO 2-N 2-He system is used to describe the dynamic processes of a mechanical Q-switched CO 2 laser that is set up using a fast chopper. We put special emphasis on the effect of dynamical parameters on the laser intensity. It takes into account the effects of electrical excitation, energy transfer processes, thermal energy transport, as well as the dissociation of CO 2 molecules and rotational relaxation of rotational levels. The results calculated are in satisfactory agreement with experimental data.

Model and experimental investigation of frequency conversion in AgGaGexS2(1 +x)(x= 0, 1) crystals

“…Experimental setups for SHG studied are of the usual types as shown in figure 3(b). Low-pressure, mechanical Qswitched, line-tunable up to 400 Hz PRF, 0.1-1 kW peak power CO 2 laser with longitudinal dc discharge [22] and Q-switched, 30-50 ns Er 3+ : Cr 3+ : YSGG laser [23] are used in SHG experiments. A ZnSe lens with 100 mm focal length is used to focus pump beam into the AgGaS 2 crystal installed into a temperature-controlled oven operating from room temperature up to 300 • C with the accuracy of temperature being kept at ∼1 • C in SHG experiment.…”

Generalization of the 6-Temperature model for simulation of super-atmospheric pulsed CO2 lasers output

“…This model provide better simulation results (in respect to 4 and 5-temperature previous models) by taking into account more vibrational energy levels involved in population distribution [3][4][5][6][7]. Nowadays, this model is widely used to theoretical analysis of CW [3,4] and TEA CO 2 [5][6][7] lasers operation, mathematical modeling of the tunable [8] and hybrid [9][10][11] CO 2 lasers, dynamic analysis of Q-switched TEA CO 2 lasers [12] and recently, CW CO 2 laser pulse amplifier [13]. The main development features of this model can be summarized as: (a) taking into account the transitions between the rotational levels of each vibrational state such that, for each vibrational level the rotational relaxations are no longer considered as sudden [14,15].…”