Infrared Spectral Responsivity Scales At NPL And The Calibration Of Detectors

Freeman, G H C; Nettleton, D. H.

doi:10.1117/12.969684

Cited by 1 publication

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“…As the outcome of the fast-growing QCL technology, QCLs become commercially available to cover a gap-free spectral range of (3)(4)(5)(6)(7)(8)(9)(10)(11)(12) μm. The finely-controlled long-term stability is highly required to further reduce the uncertainties of the ACR-based optical radiant power measurement and the SR scale.…”

Section: Future Improvementsmentioning

confidence: 99%

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Mid-infrared spectral responsivity scale based on an absolute cryogenic radiometer and a tunable quantum cascade laser

Liu¹,

Xu²,

He³

et al. 2021

Metrologia

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The spectral optical radiant power of a quantum cascade laser (QCL) in the (7.35–10.6) µm spectral range has been measured using a Y-shape absolute cryogenic radiometer (ACR). The spectral responsivity (SR) of a transfer detector based on an integrating-sphere-coupled mercury-cadmium-telluride (IS-MCT) photoconductive detector has been calibrated. The optical radiant power of the QCL can be adjusted and stabilized in the range of (0.035–0.6) mW. The relative uncertainty of the ACR-based optical radiant power measurement was evaluated to be 0.023%–0.04% (k = 1). The relative uncertainty of the SR calibration of the IS-MCT transfer detector was analyzed to be 0.097%–0.16% (k = 1). The spectral range for the SR calibration can be extended to cover (3–12) µm using commercially available QCLs.

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Section: Future Improvementsmentioning

confidence: 99%

“…Thermal detectors with nearly flat spectral absorptivity have been used as transfer standards to extend the SR scale from visible or near infrared to the MIR range [11][12][13][14][15]. The method requires the optical radiant power and then the SR at only one wavelength point in the nearly flat absorption spectrum to be calibrated.…”

Section: Introductionmentioning

confidence: 99%