Regular Article

Design and simulation of locally enhanced microchannel heat sink for diode partially pumped slab laser

¹ National Key Laboratory of Micro/Nano Fabrication Technology, Shanghai Jiao Tong University, Dong Chuan Road 800, Shanghai 200240, P.R. China
² School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Dong Chuan Road 800, Shanghai 200240, P.R. China

^* e-mail: wyyw@sjtu.edu.cn; Cecilia_Sun@sjtu.edu.cn

Received: 3 September 2020
Received in final form: 24 November 2020
Accepted: 24 December 2020
Published online: 22 January 2021

Abstract

With the power level of diode-pumped solid-state laser (DPSSL) rising continuously, its thermal effect has become the main problem limiting the laser performance. In this paper, based on the heat distribution of diode partially end-pumped slab (Innoslab) laser, a shunt rectangular microchannel heat sink with locally enhanced heat dissipation is designed. Firstly, multi-stage parallel short channels are designed in the heat concentration area to enhance the solid-liquid heat exchange in this area, and the effects of structure and working conditions on its heat dissipation performance are investigated. Secondly, the copper layer is introduced into the end face of the low thermal conductivity crystal to form a high thermal conductivity path, which alleviates the heat accumulation inside the crystal. Under a certain condition, compared with the traditional liquid-cooled plate system, the maximum temperature of the laser crystal is reduced from 169.62 to 118.18 °C, the pressure drop is reduced by 66.75%, and the total mass of the system is reduced to 4.87% of the original system, which effectively improves the practical performance of the device.