Abstract
A rate equation model of a pulsed H(2) + F(2) chemical laser is used to examine the relative importance of rotational nonequilibrium mechanisms on laser performance. This computer model yields the time history of the first thirteen rotational levels and the first twelve vibrational-rotational P-branch transitions for the first six vibrational bands of HF. With this model, the general effects of rotational nonequilibrium on the H(2) + F(2) laser were found (1) to increase the number of transitions that lase simultaneously, (2) to lower the intensity of each transition, and (3) to extend the duration of lasing on each transition; these trends are similar to those observed earlier for the F + H(2) laser. The major thrust of the present work is to isolate the relative importance of the various rotational nonequilibrium mechanisms. To this end, we have examined and compared several approaches to modeling R-T and V-R relaxation, nonequilibrium pumping distributions, and line-selected operation. The effects of these mechanisms (and their relative importance) on the laser output are clearly revealed by the model. The character of the spectra for the H(2) + F(2) model is significantly different from that observed for the F + H(2) model. The ability of the model to predict spectra observed in experiments is assessed, and the model is found to compare well with discharge-initiated lasers. Additional calculations demonstrate the effect of multiquanta V-T deactivation of HF by HF.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.