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© 1990-2002 J.Paul Robinson,
Purdue University BMS 631 –
LECTURE007.PPT
Avalanche
Photodiodes (APD’s)
•Combines the best features of PMTs and photodiodes
•High quantum efficiency, good gain
•Gain is 102-103 (much less than
PMTs)
•Problem with high dark current
Image From:
http://micro.magnet.fsu.edu/primer/java/photomicrography/avalanche/
