Optical chopper applied for calibration of vacuum ultraviolet detector

LU Fei; ZHANG Boni; QIN Yan; HU Tieli; YU Bing; SUN Yu’nan; CAO Feng

doi:10.5768/JAO202243.0204003

Journal of Applied Optics > 2022 > 43(2): 325-330. > DOI: 10.5768/JAO202243.0204003

LU Fei, ZHANG Boni, QIN Yan, HU Tieli, YU Bing, SUN Yu’nan, CAO Feng. Optical chopper applied for calibration of vacuum ultraviolet detector[J]. Journal of Applied Optics, 2022, 43(2): 325-330. DOI: 10.5768/JAO202243.0204003

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Optical chopper applied for calibration of vacuum ultraviolet detector

Xi'an Institute of Applied Optics, Xi'an 710065, China

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Received Date: October 26, 2021
Revised Date: December 24, 2021
Available Online: February 21, 2022

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Abstract

Abstract

In order to precisely calibrate the absolute spectral responsivity of detector from 115 nm~400 nm based on cryogenic radiometer, an optical chopper used in vacuum was developed. The optical chopper consisted of blade, rotation axis, servo motor, U-shaped photoelectric switch, cooling module, bracket and controlling circuit could be used to modulate the weak vacuum ultraviolet-ultraviolet (VUV-UV) radiation signal to the alternating radiation signal which the frequency was known in vacuum cryogenic environment, and measured by lock-in amplifier. The experimental results show that the stability of the optical chopper is ±0.05 Hz at the frequency of 80 Hz, which meets the requirements of absolute spectral responsivity calibration of detector at 115 nm~400 nm in the vacuum environment of 10⁻⁴ Pa.
- vacuum environment,
- optical chopper,
- modulation,
- cryogenic radiometer,
- spectral responsivity

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Optical chopper applied for calibration of vacuum ultraviolet detector