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OK, I did some research (that you could have done too). The best option seems to mount some "laser head" onto your "printer" that is capable to produce a couple of watts and that is itended for such application, like this one or this one. But other than the advertizing states, the feedbacks do...

I'm still not really sure if I understand WHAT you want to do. Cutting out the circuit paths by vaporizing the copper on a dual sided conventional PCB blank? --> No. Not with any of that. "painting" the circuit onto the UV sensitive lacquer with an UV laser so you later can etch the copper...

I can't think of a way to PROVE safety for such a scenario. Some unknown and unforseen problem might inhibit any safety device. Looking at the application made me wonder how a directed light ray might find the intendet target and keeps locked at it. I remember an article several years ago...

I dont't think your wish can be granted. A 3W blue laser diode ist quite powerful. However the beam is pretty divergent in one axis ( i.e. a line or bar instead of a dot) and will not give you a perfect focus like a "single mode" (TEM00 mode = circular with gaussian profile) Laser. Multi-mode...

Ah, well. I see. No clue. Otherwise you certainly would ask different questions on this topic. There are several problems here. Matal usually is quite reflective so 90+% of the light is simply reflected elsewhere. To engrave metal you will need a really strong Laser source and waste most of its...

Yes, this means the beam is 5 times more powerful and 5 times more dengerous. Before playing around with such a device, you should take every possible precaution and wear proper safety goggles. Just because the laser comes in a handy size does not imply that this is in any way easy to handle...

Only the 532nm lasers produce IR that might leak out. 520nm is a pure green. The reason for the IR in the 532nm modules is how the green light is produced. There you start with a powerful IR diode (808nm) that pumps a YAG crystal that itself lases at 1064nm. THIS light is fed into a frequency...

If you use a really short wavelenth AND you shoot at an angle, there might pop up an additional point. The first solution with 6 beams is: wavelength = 399nm Angle = 11.5° Spacing = 1µm (1000 lines/mm) (m-2 = -86°, m-1 = -37°, m0 = -11.5°, m1 = 11.5°, m2 = 37°, m3 = 86°) No solution at...

Could someone who gets only 3 dots with a blue laser try to flip the grating over and shoot it from the other side? I have not seen any description how these cheap transmission gratings actually are built, but there „should“ be some structure right on top of one of the surfaces, so there should...

Then you are defying physics, the grating is not 1000 lines/mm or the laser is not 502nm (or has a pretty broad peak around that) - or this is some inner reflection. :confused: At 500nm the second order diffracion is a full 90° from the incomming beam, i.e. fully sideways. At >500nm there is no...

I may not aply for the deal, but here is my guess: Theory permits a second order spot (5 beams) on wavelength <500nm, but real worls physics will not allow that due to geometrical constraints on the grating. I would not expect any interference beam further off than 45° to the grating normal to...

Yes, this is probably a very personal opinion and nobody must agree. This ist not the topic here. I could elaborate on that elsewhere. Somewhere within this chain some as***le decided that it is OK to sell this high power laser as a "class 1 complying device", knowing that it is not. Accepting...

I did get you right, but you missed the subtile sarcasm in my answer. No, I don't want to see a gun in the hand of any person, child or not, loaded or not. However there are people that think the best answer to the danger of weapons is "even more weapons". So then we are d'accord. Shit happens...

Cars, sticks, fire, knifes, height, ... these are all dangers one can judge quite intuitively. These dangers scale linear. You can try it a bit and a bit more and ouch, now it hurts. So you can draw a line between safe and dangerous and you will know when you are near that border. Evolution has...

Yes it may be mom's fault. technically. You should not forget that most people out there do not share your knowledge and have to believe the judgment of others, like it was sold as a toy, so it MUST be safe It might be labelled "correctly" Yes it IS very bright, but isn't this just what it...

It's always interesting to learn something new. This calculator lead me to "ISO/CIE 10527 (1991) CIE Standard Colorimetric Observers definition", via the "spectral luminous efficiency function V(λ)" [up to here], where all these eye sensitivity numbers are available in 0.1 nm steps...

Well, any of the "greens" will get you most visibility per mW, as stated before. On the other hand, it might depend on your application for the Laser. What do you want to achieve with it? Nowadays you get almost every color as bright as you might need. Bright enough to blind you instantly, if...

Try this method: Even if you do not measure the exact wavelength, the variation in the diffraction angle should be obvious. If you don't want to measure the true grating distance of a CDR, you can assume 667 lines/mm for a 700MB CDR as shown in the video.

Maybe I can throw in my 2ct here. While I'm new to LPF, I'm not new in the physics involved. Take a quick look at *this explanation of the diffraction grating formula*. It breaks down the complicated looking math into some easy triangulation. The essence is: The lower the spacing (higher number...

A couple of abbrevations are commonly used in different boards. These are the ones one will pick up quite quickly, even if you are not a native speaker. Depending on the topic of the forum, quite a lot are highly specific to a certain community where the general knowledge of discussion culture...