4B5 - Progress and applications of Q-switching techniques using molecular gas lasers

Abstract
The characteristics of aQ-switched CO2-N2-He molecular laser are considered. In particular, it has been found that a 3-W continuous system gives aQ-switch output power in excess of 10 kW per pulse. A method for determining rotational collision cross sections for CO2is discussed, and an induced fluorescence technique is described which is capable of giving cross sections for vibrational relaxation in CO2. The importance of various collisional coupling mechanisms and relaxation rates in determining total CW andQ-switch output power is also considered.