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Published April 2022 | public
Journal Article

Spectral Response of UV Photodetectors for Barium Fluoride Crystal Readout


Because of its fast scintillation peaked at 220 nm with a decay time of less than 0.6 ns, barium fluoride crystals have attracted broad interest in the community pursuing ultrafast detectors for future high energy physics (HEP) experiments and GHz hard X-ray imaging for future X-ray free-electron laser (XFEL) facilities. A crucial issue for its application is the spectral response of photodetectors down to vacuum ultraviolet (VUV). In this article, we compare quantum efficiency (QE) and photon detection efficiency (PDE) spectra measured for several ultraviolet (UV) photodetectors down to 200 nm. Their figures of merit on the detection efficiency for the fast component and the suppression of the slow component are also discussed.

Additional Information

© 2023 IEEE. Manuscript received December 12, 2021; accepted February 5, 2022. Date of publication February 7, 2022; date of current version April 19, 2022. This work was supported by the U.S. Department of Energy, Office of High Energy Physics Program, under Award DE-SC0011925. The authors would like to thank Dr. P. Hink for providing the solar-blind photocathode investigated in this work.

Additional details

August 22, 2023
October 23, 2023