Distributed face cooling scheme for tiny laser power scale-up

In this work, we have compared the performance of single rod crystal to a newly developed Distributed Face Cooling (DFC) structure which was made by surface activated bonding technology and allowed to combine transparent heatsink to a gain crystal at room temperature. The Sapphire and Nd3+:YAG crystal plates were combined in this fashion to produce nine crystal chip which was further used to obtain CW output. Slope efficiencies obtained in this experiment were 27% and 64% for single rod and DFC structure, respectively. This is the first demonstration of distributed face cooling system outperformed conventionally single rod system.