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Efficiency Evaluation of Laser Diode in Different Driving Modes for Wireless Power Transmission

The high-intensity laser power beaming (HILPB) system is one of the most promising system in the field of long-range 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 electro-optical conversion efficiency of LD. This paper centers around LD model and its current source driver. The conversion efficiencies of the two driving modes are evaluated by means of simulations and experiments. The experimental results are shown to verify the theoretical analysis.