全固态碟片激光器的多孔泡沫热沉传热特性研究

高功率全固态碟片激光器在运行中产生的热透镜效应会引起激光器输出功率降低、光束质量退变,针对该问题本文将多孔碳化硅泡沫和毫米通道引入到全固态碟片激光器的换热热沉中,并将其应用于多冲程泵浦的全固态碟片激光器.利用有限元分析软件对其结构模型参数进行了优化,当碳化硅厚度为2 mm,孔隙率为40%,入水口压力为4 kg(0.4 MPa)时,系统理论换热系数为1.51×10^5 W/m^2·K,实验测量结果为1.45×10^5 W/m^2·K,理论和实验结果较为接近,验证了理论模型的正确性.最后利用该新型热沉搭建了基于Yb∶YAG的24冲程全固态碟片激光器实验装置,获得输出功率为393 W,波长为1030 nm的连续激光输出,光-光转换效率达到52%,光束参数乘积为5.918 mm·mrad.

Research on Heat Transfer Characteristics of Porous Foam Heat Sink for All Solid State Thin Disk Lasers

The thermal lens effect of high-power all solid state thin disk lasers in operation can cause the laser output power to decrease and the beam quality to deteriorate.In this paper,focus on this problem,porous SiC foam and millimeter channels are introduced into the heat transfer heat sink of the thin disk laser and applied to all solid state thin disk laser.The finite element analysis software is used to optimize the structural model.And the simulation analysis indicates that,when the thickness of SiC is 2 mm,the porosity is 40%and the inlet pressure is 4 kg(0.4 MPa),the theoretical heat transfer coefficient is 1.51×10^5 W/m^2·K,the experimental heat transfer coefficient is 1.45×10^5 W/m^2·K,the results are similar to each other,which verifies the correctness of the theoretical model.Finally,the new heat sink is used to build a 24 multi-passes all solid state thin disk lasers experimental device based on Yb∶YAG.The continuous laser output with output power of 393 W and wavelength of 1030 nm is obtained,the optical-optical efficiency is 52%and the beam product parameter is 5.918 mm·mrad.