[Laser] Strange effect

[f1avyopto at aol.com]

Hi all
I need some help to evaluate a strange effect
I try today to bias direct way some PIN silicon phodiodes with a rather high current.
Some large area epoxy case photodiodes (1 cm²) was biased to 20 mA without apparent damage.
In dark condition I cannot see any light but a K3PGP RX with a silicon photodiode receives a signal to 20 cm...
A germanium phototransistor gives a strongest response...
I got also a solid signal with a pyroelectric detector from a motion detector.
What could be the bandwidth and the spectrum of this produced light ?
Thank you for the help.
73
Yves F1AVY
http://f1avyopto.wifeo.com/