Development of fs laser cooling system using Peltier device for laser stabilization

Titanium sapphire shows characteristics of poor output stability due to different laser cavity length due to thermal expansion of the gain medium. In this study, we have improved the problem of poor output stability. A Kerr lens mode locking titanium sapphire laser resonator with a specification of 1 W, 100 fs, and 800 nm-center wavelength was developed. The laser system was designed with a continuous light laser structure using titanium sapphire crystals as a gain medium, then distributed correction was performed by inserting a prism pair, and a manual mode locking pulse laser based on the Kerr lens effect was produced. Then, a water cooling system applied with a Peltier device was designed and applied to the laser system we developed. The experiment was conducted by comparing the cooling efficiency between the water cooling system to which the Peltier device was applied and the general water cooling chiller. Through the water cooling system to which the Peltier device was applied, the thermal properties of titanium sapphires with poor output stability could be improved. In addition, short term stability could also be improved.