Abstract
We report the results of an efficient solar pumped semiconductor laser system that uses high efficiency multi-junction photovoltaic cells and laser diodes in order to achieve the sunlight to laser light conversion efficiency of over 10% without any active cooling and concentration optics. Semiconductor lasers with wavelength from 445nm to 1550nm are powered directly by an array of photovoltaic (PV) cells under one sun illumination (100mW/cm2). The maximum energy efficiency reaches 10.34% at 976nm with an output power of 4.31W. This system is inherently more efficient than direct solar pumped lasers that have been studied in the past and could play a key role in future renewable energy production and power beaming applications.
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