| Summary: | Recent developments in long wavelength and cryogenic laser power converters have unlocked record performances in both areas. Here, devices for an optical input at ~1470 nm are studied for cryogenic applications, combining these cryogenic and long-wavelength attributes. Multijunction laser power converters are demonstrated to have a high-efficiency operation at 77 K. The photovoltaic-power-converting III-V semiconductor devices are designed with InGaAs-absorbing layers, here with 10 thin subcells (PT10), connected by transparent tunnel junctions. Unprecedented conversion efficiencies of up to 67.5% are measured at liquid nitrogen temperatures with an output power of P<sub>mpp</sub> = 1.35 W at an average optical input intensity of ~62 W/cm<sup>2</sup>. A remarkably low bandgap voltage offset value of W<sub>oc</sub>~50 mV is obtained at an average optical input intensity of ~31 W/cm<sup>2</sup>.
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