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Generalized Electrical Substitution Methods and Detectors for Absolute Optical Power Measurements

Published

Author(s)

Solomon I. Woods, Jorge Neira, James E. Proctor, Joseph P. Rice, Nathan Tomlin, Malcolm White, Michelle Stephens, John H. Lehman

Abstract

We have developed generalized methods for electrical substitution optical measurements, as well as cryogenic detectors which can be used to implement them. The new methods enable measurement of arbitrary periodic waveforms by an electrical substitution radiometer (ESR), which means that spectral and dynamic optical power can be absolutely calibrated directly by a primary standard detector. Cryogenic ESRs are not often used directly by researchers for optical calibrations due to their slow response times and cumbersome operation. We describe two types of ESRs with fast response times, including newly developed cryogenic bolometers with carbon nanotube absorbers, which are manufacturable by standard microfabrication techniques. These detectors have response times near 10 ms, spectral coverage from the ultraviolet to far-infrared, and are ideal for use with generalized electrical substitution. The generalized method and fast detectors greatly expand the range of optical power calibrations which can be made using a wideband primary standard detector, which can shorten calibration chains and improve uncertainties.
Citation
Metrologia
Volume
59

Keywords

electrical substitution, ACR, carbon nanotubes, TES, optical power, power calibration

Citation

Woods, S. , Neira, J. , Proctor, J. , Rice, J. , Tomlin, N. , White, M. , Stephens, M. and Lehman, J. (2022), Generalized Electrical Substitution Methods and Detectors for Absolute Optical Power Measurements, Metrologia, [online], https://doi.org/10.1088/1681-7575/ac72dc, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=933299 (Accessed November 27, 2022)
Created June 17, 2022, Updated August 5, 2022