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The project oozes forward, so your reply remains timely. Preliminary tests suggest a 40% duty cycle is workable. So a little loss here or there doesn't seem a big issue. Motivated by cowardice (or maybe we'll say "informed caution"), experimenting to date I've left the factory lenses...

I've purchased one of these 405 nM TTL modules, http://www.aixiz.com/store/product_info.php/cPath/71/products_id/437/osCsid/c2d8dafd1f5eaab5671f0e8ee4d64784 These are supplied with a glass 3 element lens, adjusted to a collimated beam, and presumably to nominal 150 mW output. Perhaps out of...

TTL is defined as 0-5 volts, with an actual crossover from "off" to "on" well below the 2.5 volt halfway point. That module probably doesn't implement true TTL, but rather uses the term to mean "0-5 volts". 12 volts will almost certainly kill the control circuit. If you have a single 12 volt...

What sort of divergence angles can we typically expect from a single mode diode, without optics, eg coming straight out of the diode can? Should I assume I'm most likely to find a suitable diode in the 600 nm range?

Close. I'm agnostic about wavelength, don't even care if it's visible. While I plan on manual, static focus, the laser need not be visible to do that. I'm planning to use one of the $30 chinese usb microscopes (or a modified webcam, which is pretty much the same thing) to do my looking for me...

Excellent, this sort of practical specific is very helpful. I'm hoping so. My thought is prototype 1 gets a heavier laser than needed, I'll reduce average power by pulse width modulation to discover what's truly needed, then prototype 2 would (assuming all went well) use a smaller, cheaper...

Yes, okay, 0.001 inch = 25.4 microns, so while I'd really like 30-40 microns, 80-100 might work. And I understand the edge will be a bit fuzzy, so any measurement of spot diameter is a bit imprecise by its nature. The goal is to fuse laser toner particles, as a slightly new variation on making...

Hi gang, I don't know enough about optics to do this on my own, so I'm hoping for some advice. My project has a couple of tight constraints and a bunch of loose ones, so I'm hoping it's feasible. First off, the goal is to melt plastic in a very small spot, and it's cost sensitive. (Those two...