- Feb 22, 2008
Whilst it is possible (more with the red diodes), it is unlikely to cause you a problem. The 520 diode is InGaN and primarily operates in the lower end of the spectrum. It is even less likely that a well made diode will output ir as well as visible. I haven't done too much research into diode technology but I'm sure most diodes don't output ir unless defective.
I don't even see how a defective diode would produce IR (unless it was an IR diode to begin with).
It wouldn't make sense from a design standpoint to have an LD that lases both 520nm and IR (I haven't even seen anything to suggest it has ever been done anyway, even with Multi-Quantum-Well structures or any other InGaAs technology) - unless you needed IR for some reason ... In which case you'd likely just combine an IR diode with a 520nm diode...