The response characteristics of bi-alkali photocathode PMT to infrared light [双碱光阴极PMT对红外光的响应特性]

作者：Yin S.; Ma L.; Qian S.^*; Gao F.; Zhu Y.; Wang Z.; Ning Z.; Wang Z.; Chen P.; Yuan B.

来源：Nuclear Techniques, 2018, 41(1): 010401.

DOI：10.11889/j.0253-3219.2018.hjs.41.010401

• Bi-alkali photocathode
• Infrared response
• PMT
• Single photon test

Background: The spectral response range of the bi-alkali photocathode photomultiplier tube (PMT) is 300 nm to 700 nm. So infrared light is often used as a background light of PMTs during producing or testing. However, the PMT had a red storm, when use the infrared light emitting diode (LED) for its calibration. Purpose: This paper aims to prove that the PMT itself is really responsive to infrared light, rather than the presence of stray light in the LED. Methods: The infrared light was used to interfere the single-photon state of bi-alkali photocathode PMTs. Results: When the power of the infrared laser tube is up to mW, the single photon state of PMTs changed. Conclusion: It is proved that the bi-alkali photocathode PMTs does respond to the infrared light.

• 单位
  中国科学院大学; 核探测与核电子学国家重点实验室