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Hello What lens should i use for 405nm laser if i am after the smallest dot size possible at 200-300mm focal length? I am not concerned about power losses (50% would propably be OK), but i want a round small spot from a standard 405nm laser module (this is for building a galvo based SLA 3D...

Well... every CD drive ever produced have a (near)-IR laser inside...

So it is basically a pulsed high-powered laser with a relatively thick beam passing trough a lens with relatively short FL and then directed into the "crystal" with a galvo mounted on the Z-axis of a 3-axis CNC-controlled portal? Anyone have any idea about how many watts?

You should make it look like the PhaSR rifle :) upload.wikimedia.org/wikipedia/commons/7/73/PHASR_Rifle.jpg

Or switch from 18650s to A123 Cells, just buy two of the DeWalt 36V A123 packs on eBay! For example: eBay no 310109058199. These Lithium Nanophosphate Cells are rated for 70A continuous and 120A peak for 10 Sec!!! One of them should be more than enough to drive your laser, but if you buy two...

Roithner Lasertechnich have some laserdiodes in the wavelenght you are after: roithner-laser.com/LP-laserdiodesIR.htm They are not the cheapest tough, but it does not hurt too look at the prices...

Re: OUTRIGHT BUY! 15W RF EXCITED CO2 BURNING LASER Is the status in the first post still correct (that there is two complete lasers left for 350+shipping) ? If so, i am a little intrested... // Erik aka Meduza

Re: PHR-803T HIGH POWERED HD-DVD diodes! OFFICIAL I just heard about this GB from dar303 a few minutes ago, if at all possible i would be in for two units! Going to sleep now, but i can pay the first thing in the morning, (in about 10 hours from now)! // Meduza