Near infrared radiometer standards

We are developing new detector-based radiometric scales in the near infrared to extend existing spectral radiant power calibrations(1) to spectral irradiance and radiance calibrations. High accuracy irradiance and radiance meters have been developed to realize these new detector-based radiometric scales. Mechanical, optical, and radiometric design considerations of Ge and InGaAs radiometers are discussed. Calibration principles and design considerations of the calibration setup are also described. Several results of preliminary radiometric characterizations are reported.