Kinetic Approach to Radiative Nonequilibrium Flow With Application to Gas Flow Lasers
Abstract
A kinetic approach to nonequilibrium flow of lasing gas is presented. The author introduces a new gain related to molecular speed (GMS) and develops an approximate method of solution. These treatments make it possible to exactly describe the interaction between radiative field, macroscopic flow and microscopic molecular motion. In the case of CO2 gas flow lasers, the zero-order approximation solutions of this theory are already satisfactory in that they are valid for the whole pressure range. The results of the zero-order solutions agree well with numerical results, and are in accordance with those of the currently accepted rate-equation theory (RET) in the high pressure range. For zero flow speed, this theory leads to the well known theory of non-flow gas lasers. One of the present conclusions is specially worth noting, i.e., when low-pressure broadening constant lambda < 0.2, the rate-equation theory, although the line shape factor of the revised pressure effect was introduced, cannot correctly account for the effects of inhomogeneous broadening.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 22, 1991
- Accession Number
- ADA241046
Entities
People
- Gao Zhi
Organizations
- National Air and Space Intelligence Center