Theoretical and experimental study of nanosecond pulse amplification in a CW CO2 amplifier

Gain measurements of longitudinally excited CO2 laser using low-pressure gas without helium

“…The transition from the laser upper level (001) to the laser lower level (100) causes CO 2 laser oscillation in the 10.6 μm band, and the transition from the laser upper level (001) to the laser lower level (020) causes CO 2 laser oscillation in the 9.6 μm band. For example, small signal gain coefficients of CW CO 2 lasers with a direct current (DC) discharge and a longitudinal excitation scheme were reported to be about 1.1%/cm with a discharge volume of 754 cm 3 , a CO 2 /N 2 /He gas mixing ratio of 1:3:8, a gas pressure of 10.4 kPa and a discharge current of 90 mA, and 0.64%/cm with a discharge length of 210 cm, a CO 2 /N 2 /He gas mixing ratio of 1:5:30, a gas pressure of 6.5-6.9 kPa and an input power of 70 kW [15,16]. Small signal gain coefficients of short-pulse CO 2 lasers with a pulsed discharge and a transverse excitation scheme were reported to be 3.0%/cm with a discharge volume of 360 cm 3 , a CO 2 /N 2 /He gas mixing ratio of 1:1:3, a gas pressure of 66.7 kPa and an input energy of 36 J, and 2.9%/cm with an electrode length of 50 cm, a discharge gap of 5 cm, a CO 2 /N 2 /He gas mixing ratio of 3:1:16, a gas pressure of 97.3 kPa and an input power of 180 W, and about 2.5%/cm with a discharge volume of 1200 cm 3 , a CO 2 /N 2 /He gas mixing ratio of 2:1:12 and an input energy of 120 J [17][18][19].…”

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].…”