Theoretical and experimental analyses of the TEA CO2 lasers dynamics by six temperature vibrational-rotational model

Comparative study of spark pin-array and printed circuit board surface plasma pre-ionization systems for transversely excited atmospheric CO2 laser performance

“…The obtained data together with the simulation results based on the sixtemperature vibrational-rotational model (6TVRM) are summarized in table 1. Details of the 6TVRM simulation can be found in our previous work [17]. It can be found from the table that when the SPA preionization system is employed, the output energies under different conditions are always higher and also closer to the simulation results than the corresponding values obtained using the PSP pre-ionization configuration.…”

“…Also, two rows of 24 equally distance spark gaps, individually connected to a 200 pF capacitor (providing a total capacitance of 4.8 nF), are symmetrically positioned along both sides of the discharge volume. The laser is driven by a common discharge circuit whose performance has been described in our previous work [17]. In PSP configuration, the same discharge volume is produced using a similar Ernst profiled Al electrode, 1.8 cm separated from a specially patterned 160 × 530 mm 2 doubleside PCB electrode.…”

Investigation of the multi-spectral line output characteristics of a multi-atmospheric CO2 pulsed laser

“…See Refs. 10–15 for the physical parameters, physical constants, relaxation rates, and their meanings in the above equations.…”

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

“…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]. Because, the relaxation times of the sub-levels in atmospheric pressure are in ns order and hence the equilibrium assumption for the rotational states is not more valid in ns regime; (b) using an one-dimensional spatial model along with taking in account the spatial variation of the active medium [16].…”

“…Because, the relaxation times of the sub-levels in atmospheric pressure are in ns order and hence the equilibrium assumption for the rotational states is not more valid in ns regime; (b) using an one-dimensional spatial model along with taking in account the spatial variation of the active medium [16]. This model is closer to reality in the case of long cavities with non-uniform active mediums; (c) modeling of the discharge volume with a distributed non-linear RLC circuit in order to calculate the electron density inside the discharge plasma column based on the electrical properties of the laser deriver circuit as well as the pre-ionization system geometry [7,15]. Therefore, the electron density can be more accurately calculated in relation to the type and elements of the discharge circuit.…”