Reliability of QCW diode stack as high power SSL-pump sources for large IFE facilities

Reliability and lifetime prediction are key factors to the success of laser diode stack array implementation in IFE (Inertial Fusion Energy) infrastructure. With state-of-art high QCW power laser diode bars as building block of the Lumibird stack product, extensive testing has been carried out under a range of power and diode junction temperature conditions to derive the acceleration law factors, suitable for Solid State Laser optical pumping in IFE application cases. A compound acceleration law including a power function of peak optical power, and an Arrhenius function proves similarity to known acceleration law in CW (especially the same Activation energy of 0.6eV) but with a much heavier power exponent factor (N=6 in place of 2 in CW).