Benm
0
- Joined
- Aug 16, 2007
- Messages
- 7,896
- Points
- 113
The red light you are seeing is -definitely- IR.
The problem could be blown pump diode (likely if you powered it from any powersource without a driver), something that is very hard to repair and not worth the effort on a $10 module. You typically still be able to see some IR light in this case as the pump diode bascially works like a (powerful) LED, but it will never be useful to pump the crystal set again.
All this is assuming the diode is actually blown. If it was supplied without a driver, you need to control the current to the diode carefully. If the current is too low, the pump diode will emit red light but the doubling process will not work... so increasing the current a bit can be worthwhile if in doubt.
As for green modules without a driver: you rarely see them indeed, but it would save me time removing the driver when using them in projectors and such, so i guess there is a market for them.
The problem could be blown pump diode (likely if you powered it from any powersource without a driver), something that is very hard to repair and not worth the effort on a $10 module. You typically still be able to see some IR light in this case as the pump diode bascially works like a (powerful) LED, but it will never be useful to pump the crystal set again.
All this is assuming the diode is actually blown. If it was supplied without a driver, you need to control the current to the diode carefully. If the current is too low, the pump diode will emit red light but the doubling process will not work... so increasing the current a bit can be worthwhile if in doubt.
As for green modules without a driver: you rarely see them indeed, but it would save me time removing the driver when using them in projectors and such, so i guess there is a market for them.
