Chinese Optics Letters, 2019, 17 (9): 091201, Published Online: Jul. 24, 2019   

Absolute cryogenic radiometer for high accuracy optical radiant power measurement in a wide spectral range Download: 822次

Author Affiliations
Division of Optics, National Institute of Metrology, Beijing 100029, China
Abstract
An absolute cryogenic radiometer (ACR) with a detachable optical window was designed and built for high accuracy optical radiant power measurement and photodetector spectral responsivity calibration. The ACR receiver is an electroplated pure copper cavity with a 50-μm-thick wall and inner surface coated with a specular black polymer material mixed with highly dispersible carbon nanotubes. The absorptivity of the cavity receivers was evaluated to be ≥0.9999 in the 250 nm–16 μm wavelength range and ≥0.99995 in 500 nm–16 μm. The cavity receiver works at the temperature of ~5.2 K with nanowatt-level noise-equivalent power. The relative standard uncertainty is 0.041% for the measurement of ~100 μW optical radiant power (250 nm–16 μm) and 0.015% for ~1 mW (500 nm–16 μm).

Haiyong Gan, Yingwei He, Xiangliang Liu, Nan Xu, Houping Wu, Guojin Feng, Wende Liu, Yandong Lin. Absolute cryogenic radiometer for high accuracy optical radiant power measurement in a wide spectral range[J]. Chinese Optics Letters, 2019, 17(9): 091201.

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