Abstract
The time evolution of the pulsed Cl + HBr chemical laser is obtained by numerical solution of the coupled master equations that describe the kinetic development of the vib-rotational species and the photon densities in that system. Special attention is given to the time evolution of the distributions of rotational populations and to its effect on the system. The main conclusions reached are: 1. The rotational distribution function is non-Boltzmann throughout the laser pulse (except at high inert gas pressures) and has either a broad single maximum or a double hump structure. 2. The photon densities at low J values exhibit extended oscillations following lasing threshold. At high J's the threshold oscillations are fewer and the pulse shape is typical of a nearly steady state situation. 3. The behaviour of the laser pulse at threshold is determined largely by the pumping and radiation processes. Relaxation effects become significant only beyond threshold time. These results can be useful for the development of approximation methods for solving the laser master equations.
Original language | English |
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Pages (from-to) | 1-19 |
Number of pages | 19 |
Journal | Chemical Physics |
Volume | 21 |
Issue number | 1 |
DOIs | |
State | Published - 1 Apr 1977 |