High power laser transmission technology is based on energy transfer through a
monochromatic laser onto a photovoltaic receiver avoiding the limitations of conventional
wiring. Current technology, headed by GaAs-based devices, faces two limitations: the
intrinsic entropic losses and the degradation at high input power densities due to ohmic losses.
We propose two novel laser power converters focused on overcoming these limitations. We
use 3C-SiC as base material because of its high band-gap (2.36 eV) and its excellent
crystallographic properties in order to reduce the entropic losses. Also, the current decreases
due to the inherent flux reduction of high energy photons. To minimize ohmic losses we
explore a recently proposed vertical architecture, which can significantly reduce series
resistance around two orders of magnitude (~10 -5 Ω·cm 2 ). Furthermore, we also implement
3C-SiC in a conventional horizontal architecture to show the advantage of increasing the
energy gap to reduce the ohmic losses. The two laser power converters obtain efficiencies
above the state-of-the-art (87.4% at 3000 W cm -2 for the vertical architecture and 81.1% at
100 W cm -2 for the horizontal architecture) Taking this into account, the new devices open a
new route for ultra-high efficiency remote powered systems.
Keywords: laser power converters, 3C-SiC, wireless power transfer, high power densities