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Was just testing one of the 40W Chinese tubes in my workshop: Burns pretty nice. It's going into a cnc build.

Re: Colored Shadows: Wave Interference is a Good T I have no idea what you think is going on, but there is nothing beyond the normal "light casts shadows" effect. You are not seeing any form of interference, frequency changes or new wavelengths popping out of nowhere. Light sources in...

The entire Gallium, Indium and related metals for making liquid alloys would be a great set and Bismuth is also interesting to me. I'm not too interested in the toxic elements, and am pretty unfamiliar with the uses/cool things you can do with any of the other elements .

I can only jump in and agree that the first thing the thieves are going to do with the laser pointers they stole is shine them in each others eyes. Almost half a watt of green makes for some beautiful poetic justice.

Thanks everyone, the picture of the case was just from an online site, its the same model but mine was more worn down (been in the basement for a while). The materials make it look great but everything was just epoxied down in one go so its somewhat out of alignment etc. The motors go pretty...

I don't know if anyone has commented on that, but since its my picture I can tell you that the factor that contributed the most to that picture was a long exposure time :P. That picture was three lasers (20mW green, 5mW red, 100mW blu-ray) all pointing into the same spirograph (held down using...

I am rather skeptical of the magic 3.13 you came up with to convert temperature to mW (And how did you come up with it anyways considering you don't have a real LPM?) The heat dissipation of the black target will vary with its mass/size/thickness/material/shape.  Not only that, but the ambient...

Frankly, just looking at the dot from 1/10th of a watt is enough to make it hard to look at. I can't even imagine a full watt. Just because you can't see it doesn't mean it isn't frying your eyes. They use IR to cut metal (although not 808).

That is incorrect, by your logic the shorter the wavelength the better it burns which is absolutely untrue, CO2 lasers which are used for cutting metal etc fall very far into the infrared spectrum.  As a matter of fact, anything in the visible spectrum would be useless for cutting metal since it...

As a loose rule expect to spend around another 200-400$ again on tooling (Although its much worse for a mill). You will need a set of tools, likely a bench grinder, boring bars, taps and dies, a thread gauge, live center, chuck, a set of center drills and normal drills, possibly indexed carbide...

Assuming you have access to a laser printer you can print your own. Clear glossy, clear matte, silver, gold, plastic silver... https://secure.onlinelabels.com/General/SamplesSelectItems.aspx

Optotronics is not even comparable to dx or focalprice. I am completely confident that every laser they ship will meet or exceed specs and have impeccable build quality.

For those that don't want to watch the entire video, he has placed bits of clear plastic between two sheets so that you can shine a laser through them and produce some random patterns. I don't know if this is classified as a diffraction grating. A grating takes advantage of interference to...

IMO if you build one you will be disappointed. The beams will have different indexes of refraction and you will not be able to properly focus the laser.

If you can actually get some of these they have some rather impressive datasheets. http://www.nichia.com/specification/ld/NDB7112E-E.pdf Half a watt of 450nm :O That being said, it would likely be near impossible to get any and would probbably cost several thousand a piece.

It's all in the presentation, get some better photos. Your spiro is much better than mine, but my photography is far better so it looks more impressive. http://www.laserpointerforums.com/forums/YaBB.pl?num=1236316279

A blue laser isn't a problem assuming you have a couple tens of thousands of dollars to spend.

I generally don't focus my lasers at all since you might spend 5 minutes burning and then realize that now you need to spend 10 minutes trying to focus it perfectly to infinity. That being said, there is nothing preventing you from machining your own lens nut (very large) or machining something...

Looks like an awesome module, although IMO the fins somewhat detract from the overall design. The fins are only useful if the module is standing alone. If you try to mount the module inside a host (without the front sticking out), then the fins won't add anything and might even take away.

I built benm's thermal power meter (its in a thread somewhere) for perhaps 5$ of parts and just using its self-calibration it seems pretty accurate.  Can measure down to 2-5mW and measured a Kryton that kenom had set to 100mW as 103mW.  That laser is the only one I have that has actually been...