Can a Fried Laser Pointer or Diode Laser Module be Repaired?
Suppose someone offers you a diode laser module that has been damaged by applying incorrect power (the smoke all leaked out) for $5. Should you accept it? Is there any hope that the laser diode itself survived? The quick answer is a definite maybe IFF the module or pointer can be opened for examination or repair. If it is a potted block, forget it. The chances of success are much greater for a diode laser module since it is likely to have a proper laser diode driver with current regulation and optical feedback. These are typically so over-designed that while applying excessive voltage (well, within reason, not 120 VAC to a 5 VDC module!) or incorrect polarity may blow some components, chances are that the laser diode itself won’t feel a thing and will survive unharmed. Assuming you can get inside, repair should be possible. And, even if you end up having to replace a 5 mW laser diode (for, perhaps $10), you have made out well. High quality diode laser modules go for anywhere from $50 t
