Comprehensive Radiation Testing Of Uncooled, Free Space Coupled, Ingaas Quad Photoreceivers

We have comprehensively tested uncooled, free space coupled, InGaAs Quad Photoreceivers having 0.5 mm, 1 mm, and 2 mm diameter integrated with a low noise transimpedance amplifier (TIA) using 30 MeV Protons, 100 MeV Protons, 662 keV Gamma Rays, 1 GeV/n Helium, and 1 GeV/n Iron at room temperature of similar to 20 degrees C. These devices find multiple applications in space for differential wavefront sensing as part of a Gravitational Wave Observatory, as well as instrumentation and control for next generation space telescopes. The bandwidth of all receivers was 20 MHz which was TIA limited.All 0.5 mm and 1 mm devices were found to be fully functional at normal operating conditions and at room temperature for Protons, Gamma Rays, 1 GeV/n Helium, and 1 GeV/n Iron. Only one quadrant of a 2 mm InGaAs Quad had hard failure due to 1 GeV/n Helium Ions; otherwise it too survived all other radiation tests. Detailed test results follow in the manuscript including recommendations for future space flights. These radiation test results, combined with the earlier successful mechanical shock and vibration testing mean these devices have passed preliminary testing for space qualification.