State-of-the-art QCW solid-state lasers are demanding ever higher brightness from the pump source-conduction cooled diode laser stacks. The intensity of a QCW vertical stack is limited by the peak power of each diode bar and the bar pitch. The minimum bar pitch of the existing laser diode stacks on the market is about 400um. In this paper, we present a unique vertical diode laser stack package design to achieve a bar pitch as low as 150um, which improves the intensity of the stack by nearly 3 times. Together with the state-of-art diode laser bar from Coherent, greater than 30kW/cm² peak power density is achieved from the emitting area of the vertical stack. The p-n junction temperature of the diode bars in the device under QCW operation is modeled with FEA software, as well as measured in this research. Updated reliability results for these diode laser stacks are also reported.

Date Published: 23 February 2009
PDF: 8 pages
Proc. SPIE 7198, High-Power Diode Laser Technology and Applications VII, 719802 (23 February 2009); doi: 10.1117/12.809637

Published in SPIE Proceedings Vol. 7198:
High-Power Diode Laser Technology and Applications VII
Mark S. Zediker, Editor(s)