Laser build help

[twenglish1]

I'm looking to build a 2+ watt laser using an m140 projector diode, and was wondering if anyone had any pointers on building it, what is a reasonable price to pay for the diode? The average I have been seeing seems to be around $45, can anyone recommend a good reliable driver?

 

[IsaacT]

Google DTR Laser Shop. Buy from him. He has best prices. For build tips, use the search bar and you will find some good info. Also read the stickies.

 

[The Lightning Stalker]

Flaminpyro sells X-Drives. Those are excellent for M140 builds, just watch out, you need a good size
heatsink for the boost drivers.

 

[twenglish1]

Which would be better? A boost driver or a buck driver? I know about buck and boost converters, does the same apply here? I'm guessing a boost driver will be used for a lower voltage input supply and a buck driver will be for a higher voltage input supply?

 

[The Lightning Stalker]

A boost can run from a single 18650, but it runs hotter. A buck requires 2 cells, but it runs much cooler.
A buck driver is much easier for a beginner because of the lighter heatsink requirement, but at 1.8A, a
heatsink is still recommended, just not as big. And the thermal contact is not as critical.