Efficiency optimization inject current characteristic of laser diode for wireless power transmission

The high intensity laser power beaming (HILPB) system is one of the most promising system in the field of long-rang wireless power transfer. In HILPB system, the high power laser diode (LD) is employed for its excellent character of high efficiency, high reliability and small size. Normally, LD can operate in two different driving modes: the continuous mode and the pulse mode. The injected current has a direct effect on the electrical-optical conversion efficiency of LD. This paper centers around LD model to investigate the influence of the different driving modes on the efficiency of LD in order to maximize the efficiency of LD, and thus increase the deliver power density of the HILPB system. The efficiencies of LD in the two driving modes are evaluated by means of simulations and experiments. The experimental results are shown to verify the theoretical analysis.