Absolute Calibration of the OMEGA Streaked Optical Pyrometer

High-energy-density-physics (HEDP) experiments often rely on temperature measurements using optical pyrometry. Laser-driven experiments have time scales of picoseconds, requiring the use of a streak camera as a detector. This complicates the already formidable task of absolute calibration. We report on multiple calibration runs that used a NIST-traceable tungsten-filament lamp to calibrate the optical response of the streaked optical pyrometer on OMEGA. This entailed constructing a spectral-response function from measurements and estimates of the transmissions and responses of all components in the system as well as measurements using narrowband (30-nm) optical filters. The latter is used to normalize the estimated response. The resulting response function predicts the wideband ($\sim $300-nm) response of the system to high precision. The performance of a spectral calibration device is also presented. This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0001944.