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Low Light Level Spectral Responsivity Measurement System |
LÜ Liang1,LUO Yupeng2,JIANG Xiaomei1,LIN Xiaofeng1,PANG Bowen1 |
1. Optic Division, National Institute of Metrology, Beijing 100029, China
2. School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China |
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Abstract To meet the spectral responsivity calibration requirements of photon counting detectors, a low light level spectral responsivity measurement system is established. The feature of this system is that it can achieve spectral comparison measurement at pW monochromatic light power level. An adjustable luminance source is designed, and it is tightly coupled with the dispersion subtractive double grating monochromator to achieve power variable monochromatic light output with six orders, which can be applied to the linear working range of different photon detectors, covering the wavelength range 330~1100nm. The light-tight designation of the light path enables the system to work under normal lighting conditions, reducing the experimental environment requirements. Based on a standard detector integrated with fA grade current amplifier, the spectral responsivity measurement of the photon detectors at 1×106photons/s count rate level is achieved. The controlling and data acquisition software are developed using LabView platform, which realizes the whole process of measurement automation. The characteristics experiment of the system has been carried out, and the relative spectral responsivity of photon detector are calibrated in the wavelength range from 330~1100nm with relative expanded uncertainty is (2.5~3.8)%, k=2.
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Received: 04 February 2024
Published: 05 September 2024
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