为了解决激光二极管(LD)端面抽运固体激光器中晶棒的散热问题,结合多通道和铟封技术,设计并加工了新型散热装置。采用激光二极管端面抽运Nd:GdVO4晶棒,在输入抽运功率28 W的时候,利用传统铟包式直通孔热沉器、铟包多通道式热沉器和铟封多通道热沉器分别获得8.7 W,10.5 W和11.9 W的最大输出功率, 相应的光-光转换效率分别为31%,38%和44%,斜率效率分别为36%,42%和49%。而且采用铟封多通道热沉器,输入40 W的抽运功率时得到了17.5 W的输出功率,此时仍未见饱和。可见无论最大输出功率,光-光转换效率还是斜率效率,结合了铟封技术的多通道式热沉器都比前两种热沉器散热效果好。此外,通过对热透镜焦距和基模输出功率的测量,进一步验证了铟封技术的多通道式热沉器的优点。

To solve the thermal dissipation problem in laser diode (LD) end pumped solid state lasers, a novel heatsink was developed based on multi-channel and indium-soldered technique. Under 28 W pump power, 8.7 W (in traditional indium-wrapped heat-sink), 10.5 W (in indium-wrapped multi-channel heat-sink) and 11.9 W (in indium-soldered multi-channel heat-sink) output were obtained with the Nd:GdVO4 laser crystal, respectively. Corresponding optical-optical efficiencies are 31%, 38% and 44%, and the slope efficiencies are 36%, 42% and 49%, respectively. In addition, 17.5 W output was achieved under 40 W incident pump power when the indium-soldered multi-channel heatsink was used, and no saturation was observed. From the aspects of maximum output power,optical-optical efficiency and slope efficiency, the indium-soldered multi-channel heat-sink showed best performance among three kinds of heatsinks. And the advantage was further certified by measuring the length of thermal lens and fundamental mode output power.