Photovoltaic laser power converter based on germanium

The diffusion doping of germanium and design features of a photovoltaic converter for operation with high-power infrared laser radiation have been optimized. The chips are tested by using a uniform defocused and focused beam with the wavelength of 1550 nm. The monochromatic efficiency of $\sim$20% (0.2 W) is achieved in the case of matching the spectral sensitivity of the converters to the operating wavelength of the laser.