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I've been searching for the right mosfet, but am having no luck. How would I know what specs would future my purposes?

Sorry, the laser module runs on 3V and 250mA. The laser output is 200mw at 532nm (green). I'll look into the MOSFET; I anticipate this'll be pulsing in excess of a few minutes. Would the MOSFET work relatively the same way as the NPN? EDIT: I set up the circuit with the three AA batteries in...

Is it possible to be burning out transistor's with the current/voltage I'm working with here? I ask because I found that sometimes I measure the current/voltage to be 0 but it's solved by switching transistors.

Alright, I set it up as Sigurthr suggested and tested it that way. Result, nothing. So I switched out the laser for an LED diode and it lit up fine. I think the problem is the assembly of the laser module; the soldering was so sketch it broke up pretty easily. Tomorrow I'll be able to solder it...

Awesome! I'll try this out after I get back from work. One more question, though; the transistor amplifies current proportional to the battery output current, right? The battery's current rating is 3600mAh, so how would I predict the new current?

OK, I'm still pretty new at this terminology; what do you mean by 'continuous' ground, and doesn't the battery and the laser module share the same ground? OK, so I should move the laser module so that it's + is attached to the right lead of the npn (collector?)?

Ok, thanks. I think I found what the problem is. I replaced the laser module with a simple LED, rewired the whole object, and took some measurements. The voltage passing through the LED was about 3.7V, which is what I'd want. The current, however, was about 200mA; I'm wanting 250mA. Is switching...

Ok, here it is. I probably should have led with the picture. The LED is the laser module.

Hello all! I'm working on a project to make a laser pulse in Morse code after typing in a message. My problem is that after 3+ weeks of reading forums and (attempting) self teaching, I cannot get the laser diode to even turn on. What I've got... Green laser diode with module (3V, 250mA, 200mw)...