Study of Thermal Effects Induced by a Laser Radiation Incident in an Amplifier (II): Nonlinear Case

The present work deals with the study of the temperature distribution generated in a ruby rod resulting from (i) a pump radiation incident in radial direction and (ii) the laser radiation incident in axial direction. The pump radiation originated from a source located in one focal axis of a cylinder having an elliptical cross section while the ruby rod is mounted in the other focal axis. The study includes the effect of the focusing parameter of the pump radiation, the half width of the incident laser beam which is assumed to have a radial Gaussian intensity distribution and the saturation of the net amplification coefficient resulting from the laser beam. The results show that by decreasing the focusing of the pump radiation, the radial temperature distribution resulting from the laser beam exhibits a dip and that the net amplification coefficient grows stepwise as r increases.