Research in Gas Lasers.
Final rept. 1 Jan-31 Dec 78,
BROWN UNIV PROVIDENCE R I DIV OF ENGINEERING
Pagination or Media Count:
The work on the rate equation descriptions of pulse propagation in homogeneous media is complete and is being prepared for publication. The Pulse duration limit was chosen as long compared to the coherence time so that true coherence effects such as self-induced transparency is absent. However, the system of rate equations are velocity dependent so droppler broaden mechanisms are included. Attempts have continued to determine if it is possible to utilize a plasma break down in air to deduce velocity. Thus far, it has been determined that the magnitude of the scattered signal provides ample signal for short ranges. This technique will prove useful where conventional doppler velocimetry is not possible due to the absence of naturally occurring scattering centers. The density matrix equations for three energy level gases have been formulated. For situations were the pulse or pumping time is longer than a dephasing time, the rate equations explicity contain contributions that are nonlinear. Author
- Lasers and Masers