Eur. Phys. J. D (2013) 67: 201
https://doi.org/10.1140/epjd/e2013-40169-3

Regular Article

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

Laser and Optics Research school, Nuclear Science and Technology Research Institute, North Karegar Avenue, P.O. Box 113658486, Tehran, Iran

e-mail: koushkia@gmail.com

Received: 26 March 2013
Received in final form: 8 May 2013
Published online: 26 September 2013

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.