- Jan 20, 2008
I feel better now. Can we start over now? Maybe talk about lasers?
So, to answer your initial question, modifying a 400mW green laser is fraught with peril and is kinda silly overall. It's much easier and more effective to simply buy a quality 400mW in the first place rather than attempting to squeeze more juice out of a lousy one with the (very probable) risk of destroying it. The ways you can modify a green laser would involve either taking it apart and modifying the driver to output more current to the pump diode (aka a "pot mod"), or by replacing the batteries with higher voltage ones. Usually the pump diodes in these is not the limiting factor, but rather the quality and alignment of the crystal set. Often times the potentiometer on green driver boards is either not connected to anything or does not affect the amperage delivered to the diode. In cases where it does have an effect on current, it's usually foolhardy to do so, as the diodes in cheap high powered lasers are likely already being driven to (near) their max output. Changing the batteries to 3.6v versions rather than 3v versions often has the same effect of overdriving the diode, again, this can be risky though can sometimes net you greater output in exchange for an often greatly reduced lifespan.
All in all, it's much better in the long-run to buy a high quality laser with better crystals, since overdriving a cheap laser is very likely to kill it.
We get a lot of newbies here asking how to pot mod their green lasers, and the answer is always "Don't". There's nothing special about your case except the amount of money involved, so in your case the answer is an emphatic "DON'T!!!".
Again, I'm sorry we came off as so abrasive, but this is really the same answer we give everyone who asks this question.