Research On The Thermal Control Technology For High Power Fiber Laser

The high power fiber laser has been widely used in scientific research, civilian and military fields, as the demand for fiber laser power is becoming more and more highly, the large surface area and volume, already can’t satisfy the cooling requirements. A large amount of heat accumulation will be key for fiber laser power device damage, even affect the fiber laser system and performance. So we must to take effective thermal control technology of high power fiber laser heat treatment, in order to meet the safety requirements.This paper takes high power fiber laser as the research object, according to the cooling mechanism of fiber laser key power device, on the basis of water cooling structure was optimized, this paper proposes a space with high power fiber laser without water cooling technoiogy, main work is as follows:First of all, analysis the composition and working principle of fiber laser system, research the heat production mechanism and the rules of heat distribution with different body to generate heat. Bulid the corresponding mathematical model for heat production, respectively analyzes the thermal effect on the performance impact of different key power device. According to the different working conditions, water cooling and phase change absorption of heat two different thermal control technology for laser cooling is selected.The second, build water cold plate structure finite element simulation model in Icepak. And set up parameters for the corresponding boundary conditions, study the different for the structure, different fluid velocity ect, analyses its influence on heat dissipation. Set up the without water-cooling thermal buffer device model in the Pro/e, progress finite element thermal analysis in Workbench, get the heat distribution cloud image, increase the semiconductor refrigeration(TEC), phase change thermal storage cooling of intensive study, optimizing the cooling effect.Finally the results of optimization experiment research, contrast the simulation analysis, the cause of error is analysed, validated the reliability of the simulation and experimental one and accuracy, which is really reflect the different cooling measures, the cooling effect of different parameters.Results show that the water-cooled heat dissipation in the structure of the cold plate, fluid flow, cross section area of flow channel of water cooling influence is bigger. Based on phase change heat storage without water cooling, by increasing the metal thermal conductivity and thermoelectric refrigeration method can effectively reduce the latent heat of phase of phase change materials, the latent heat of extending the 15% of the time, reduces the work of fiber laser pulse rate, compared with aluminum heat sink quality reduced 60%, satisfies the requirement of space with solid-state, lightweight.Thus,on this basis, the kilowatt fiber laser machine for water cooling and without water cooling is designed. Provides a theoretical support and practical experience for the heat dissipation of high power fiber laser, so research the thermal control technology of high power fiber laser, especially the space thermal control technology with high power fiber laser, has engineering practical application value and theoretical significance for subsequent optimization design of high power fiber laser.