Thin Disk Laser 'Updates': M S Guided New Thermal Management Needs and Designs for High Brightness, CW Operation

摘要

In this paper, an integrated high-power thin disk laser (TDL) and a novel heat spreader having effective thermal conductivity K_(eff) > 10,000 W/m*K enables greatly improved TDL performance. The near isothermal behavior using this heat spreader reduces the TDL dynamic focusing and temperature induced-stress-birefringence and thus will improve the beam quality (BQ). This advanced heat spreader (AHS) employs a mechanically controlled, two-phase oscillating motion of the working fluid in a closed cycle, non-wicked heat pipe to achieve much higher effective thermal conductivity and resultant heat transfer, greater than kW's/cm~2. This system works better at higher powers. Further enhanced performance is achieved via use of nanoparticles and nano-fluids dispersed in the working fluid to acquire the near isothermal control of the TDL.