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Darn, now I have coffee all over my screen .. and guess what .. it's BROWN !

Why not Lasik at home ? Especially now in April .. LASIK@Home

For me, no single wavelength is violet .. I need red mixed in ..

I disagree .. 20% losses is great IMHO .. expander I made had like 90% losses .. :whistle:

Surprising as it is, yes :D

I was thinking more about spot size at some distance ..

How about some technical details ? And before/after beam shots ?

As it is from DVD it will have IR an about 200mW red. 405 is in blueray, which has more complex optics, as it has 3 wavelengths in it.

It's like buying screwdriver, or screwdriver in pen .. both are screwdrivers .. but one is just a gimmick with compromises so it fits in a pen ..

I know that quite well .. those lasers sure looks nice, with safety features and all. They are all good and you will get something for those additional money. Not power though I think, as these reds are rarely underspecs, even from random seller.

If you want to go cheap, go for those cheap reds, 200mW. Like this one: New Style red laser 200mW /adjustable [OLNRL200] - $45.99 : Zen Cart!, The Art of E-commerce It has focusable head, so you can focus it at any distance. I totally would recommend safety goggles though, especially since...

Blue would have roughly 1.5 time lower diameter, or roughly double power density then red .. if all other laser parameters would be the same. But they usually cannot be, so it is usually not as important. What is important, is what you want to burn. Different materials absorb different...

I mean .. expander only lower divergence. Max throw = less div * more power. And one way to lower div is to use expander.

Any diode or DPSS laser needs optics of some kind, as beam from the device itself has high divergence .. up to 40 degrees for diode lasers. So even to get collimated (as close to parallel as possible) beam you need optics. There is also limit to how small the spot can be. Surprisingly to get...

Well .. since beam expander decreases divergence .. it's kinda redundant statement .. But higher power will of course increase 'throw' ..

You would be better of with orgone power generator ..

Why use electromagnets ? Use permanent magnets, you will get stronger laser for free !

Oh, you are actually right. I made the math wrong. I remember this cause my 200mW red does that in 10 seconds, and my other lasers according to this formula with about 10% error. So it is indeed more like 2000/time. I guess it also depends on the case, but I came over 5 different brands and...

Focus it, and burn through black thin CD case. Then use formula: Power(mw) = 1000/time(sec) (edit: more like 2000/time .. check bellow in the thread) It's VERY rough, of course. From your description it sounds stronger then 70mW. Also 400mA is quite a lot ..