Measurement of response characteristics of photodetectors with low divergence angle dependence

Nan Xu; Zhiwei Liu; Ruoduan Sun; Yandong Lin; Qiming Fan; Xiangliang Liu

doi:10.1117/12.3035878

20 November 2024 Measurement of response characteristics of photodetectors with low divergence angle dependence

Nan Xu, Zhiwei Liu, Ruoduan Sun, Yandong Lin, Qiming Fan, Xiangliang Liu

Proceedings Volume 13241, Optical Metrology and Inspection for Industrial Applications XI; 132411M (2024) https://doi.org/10.1117/12.3035878
Event: SPIE/COS Photonics Asia, 2024, Nantong, Jiangsu, China

Conference Poster

Abstract

A low divergence angle dependent trap photodetector was designed based on two photodiodes and a concave mirror, which can adapt to measurement of both spatially collimated beam and divergent beam in a small space. To determine responsivity of the trap detector, cryogenic radiometer system is used to calibrate trap detector under the condition of collimated beam, while the angular dependence can be ignored at a certain uncertainty level. Responsivity of trap detectors based on silicon photodiodes are calibrated traceable to cryogenic radiometer, with an uncertainty of less than 0.1%. The uniformity of photodetector is measured to be about 0.03% in a 5mm×5mm sensitive area and angular dependence is less than 0.1% when the angle between the incident beam axis and the normal direction of the detector surface is less than 7 degrees. The results show that the detector with this structure has a good consistency in the response of measuring collimated light beam and divergent light beam within a certain divergence angle.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Nan Xu, Zhiwei Liu, Ruoduan Sun, Yandong Lin, Qiming Fan, and Xiangliang Liu "Measurement of response characteristics of photodetectors with low divergence angle dependence", Proc. SPIE 13241, Optical Metrology and Inspection for Industrial Applications XI, 132411M (20 November 2024); https://doi.org/10.1117/12.3035878

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