Theoretical study of small signal gain of slow flow CW CO₂ lasers with diffusion cooling

Abstract

By the use of five temperature model for an optimized laser operational condition of a slow flow CW CO₂ laser, we calculated the dependency of the small-signal gain on the discharge volume parameters such as total pressure, current discharge, rotational quantum number, CO₂ molecules dissociation level and gas velocity. For the given geometrical as well as thermodynamic balance equations to obtain the gas temperature, the small-signal gain was determined by the numerical solution of the energy density equations in various vibrational modes of CO₂ laser.