DocumentCode :
323285
Title :
A hybrid photodetector (HPD) with a III-V photocathode
Author :
Suyama, M. ; Hirano, K. ; Kawai, Y. ; Nagai, T. ; Kibune, A. ; Saito, T. ; Negi, Y. ; Asakura, N. ; Muramatsu, S. ; Morita, T.
Author_Institution :
Hamamatsu Photonics KK, Shizuoka, Japan
fYear :
1997
fDate :
9-15 Nov 1997
Firstpage :
795
Abstract :
A hybrid photodetector (HPD) combined with a III-V photocathode is considered to be an ideal photodetector, because the quantum efficiency (QE) is high, the collection efficiency is 100%, and the excess noise factor is negligible. As the first step, an HPD combined with a GaAs photocathode or a blue-enhanced GaAs (BE-GaAs) photocathode has been developed. Presently, the QE is approximately 20% from 550 nm to 850 nm, which is much higher than that of a conventional multi-alkali (S-20) photocathode. The 100% collection efficiency calculated by the computer simulation is supported by the test result of the flat uniformity. Considering the application in high energy physics using a wavelength shifter, energy resolutions of both the BE-GaAs-HPD and the conventional S20-HPD were measured using 650 nm LED light pulse. The BE-GaAs-HPD shows a resolution of 17%, finer than 34% of the S20-HPD. The experimental results are consistent with the theoretical estimation. The QE of the HPD is especially important, because the electron multiplication process is noiseless
Keywords :
III-V semiconductors; gallium arsenide; photocathodes; photodetectors; semiconductor counters; 550 to 850 nm; GaAs; III-V photocathode; collection efficiency; computer simulation; electron multiplication; excess noise factor; flat uniformity; high energy physics; hybrid photodetector; quantum efficiency; test result; wavelength shifter; Application software; Cathodes; Computer simulation; Energy measurement; Energy resolution; Gallium arsenide; III-V semiconductor materials; Photodetectors; Pulse measurements; Testing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nuclear Science Symposium, 1997. IEEE
Conference_Location :
Albuquerque, NM
ISSN :
1082-3654
Print_ISBN :
0-7803-4258-5
Type :
conf
DOI :
10.1109/NSSMIC.1997.672701
Filename :
672701
Link To Document :
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