Articles you may be interested inTheoretical modeling of a 16μm CO2 gasdynamic laser in the intracavity cascading mode A rate equation model is used to examine the time evolution of vibrational excitation and subsequent lasing of an optically pumped OF/CO, or HBr/C0 2 laser. With this model, one may simulate optical pumping of OF/C0 2 /He/N, mixtures with a pulsed OF laser, or direct pumping of CO 2 or HBr/C0 2 mixtures with an HBr laser. This model includes the simulation of optical saturation at 9.4 Mm. Rotational nonequilibrium phenomena are also included in the models. Model calculations reveal the relative importance of various kinetic relaxation mechanisms. Rotational hole burning effects are observed for all calculations simulating line selected operation. The effect of the strength and duration of the pump laser and the 9.4 Mm saturation pulse are examined. Finally, the model is found to compare well with laboratory observations of pulsed HBr/CO, laser performance. =1.5xl0 12 , M=He, = 5. 6 X 10 12 , M =N z • Seeber's calculated result is approximately seven times (3a) where Lr = kr II N/,rJ -k..,. II Nl'rJ • (3b) J J The laser cavity is assumed to have a uniform photon flux with active medium length L, mirror spacing l, and mirror reflectivities R o and R L • The rate equation for photon flux j(i, J) is CZ (i, J) = elL [a(i, J) -atbr(i)]f(i, J).
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