Studies on Dynamic Range of SiPMs with High Pixel Densities

¹ Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing, 100049, China
² University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China
³ Tsung-Dao Lee Institute, Shanghai Jiao Tong University, 1 Lisuo Road, Shanghai, 201210, China
⁴ Institute of Nuclear and Particle Physics, School of Physics and Astronomy, 800 Dongchuan Road, Shanghai, 200240, China
⁵ Key Laboratory for Particle Astrophysics and Cosmology (MOE), Shanghai Key Laboratory for Particle Physics and Cosmology (SKLPPC), Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China

^* e-mail: liuyong@ihep.ac.cn

Published online: 7 March 2025

Abstract

This study examines the dynamic range and saturation behavior of three SiPM models with pixel pitches of 25 µm, 10 µm, and 6 µm, with respective pixel counts of 57,600, 89,984, and 244,719. Using a picosecond laser as the light source and a photomultiplier tube (PMT) operating at different bias voltages as a scaler, we obtained complete response curves of these devices. The results show that SiPMs with 25 µm and 10 µm pixel pitches reached saturation near their nominal pixel counts, while the 6 µm SiPM saturated at about half its nominal count.