Optics and Photonics Society of Iran

The thermal effects in high power solid state lasers, causing heterogeneity and distortion in the active material, reduce the output beam quality and can even cause damage to the active medium. This failure generates a limitation of the maximum power attainment from lasers. A Liquid laser active medium containing solid particles in the form of nano- or micro-sized colloidal solutions, or a mixture of powder and liquid, replaces solid state material to eliminate the thermal problems of high-power lasers. In this study, the thermal behavior of the laser medium with identical active particles in two solid and liquid hosts has been compared. For this purpose, a laser cavity with four flash lamps was designed by Zemax software, and its thermal distribution was simulated by LASCAD software. The results indicate good heat transfer, lower radial temperature gradient, and removal of the heat problem in high power lasers with the fluid active laser medium.