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It all depends on the atmospheric conditions. Clean, dry air is the worst case. You will only see any light, when it is deflectet toward your eyes. Tiny droplets of moist, dust, smoke and similar. You can't see a "passing" ray of light. The colorful Laser beams in StarWars, that make a great...

You name it. It is "flattened". Both "round and flat". It is squashed "flat" by 63km/Pi = 20km or a whopping 0.17% :p Just like a frisbee, but a little less. :ROFLMAO: And it lacks a hollow bottom, as our australian friends eventually might confirm. So the similarity with a frisbee is indeed...

Well, it actually IS that way. A rather fat, almost spherical frisbee, I must confess. ;)

So then it's a good way to prove it round. Should he. But this doesn't need a Laser to do so. Light travels both ways. It's enough to point a telescope across a long lake and watch the visibility of lake shore features just at the water horizon. Daytime. This way we regulary demonstrate the...

I still try to make sense on your suggestion. Do you suggest, anyone unsure about spilled IR from a cheap 532nm DPSS laser might easily check this with his LPM? I'm quite confident, that most buyers of such cheap pointers do not have access to an LPM. "Watching the dot" from behind the safety...

Don‘t forget about windows. They may look clear, but they do reflect a considerable amount of light on each surface. If you use tripple glass windows, shining through them gets you at least 6 reflected beams scattering around - probably back to you. Even if 90% of the light passes (which would...

No certainly not. The advice to think about the IR that might pass otherwise safe „for green“ goggles or might hit someone „nearby“ is not directly related to my answer on what I do with my module, at least for what it was intended. If you know about it, you can handle it properly. Someone who...

I use it for astronomy classes. Pointing stars and constellations in the night sky. I recently found my precious dead due to spilled battery. But fortunately a suitable replacement now costs only a tiny fraction compared to what i did pay 10+ years ago. Agreed, the cheap green (532nm) pointers...

If you have bought the pointer some years ago, as the wear might suggest, you probably paid a fortune for it - as I did. But today these things are shamelessly cheap, so any attempt to fix it is not worth the hassle. It‘s probably cheaper to get a complete new one, than to get a spare case to...

7 Years are a long time in this field. What have you done back in the stone-age? Must have been something like manually grinding silicon waffers out of rocks or distilling liquid air to get hold of spurious gases to fill the self blown glass tubes. (y) Live has gotten easier in the meantime...

Even those are quite often way overspec. There are numerous „cat toys“ that are highly unsuitable for the intended use, unless you want to hurt the poor animal. It‘s so bad that mislabelled Lasers and lying sellers are so common. If you never have seen a true < 1 mW Laser, how could you judge...

I was looking for a pointer that assists me in astronomical teaching. It's much easier to point at the stars with such a device than to explain I have a rail mounted on my telescope where I can simply hold the pointer and klick the button to show where the telescope is pointing. This works, if...

Yes, #metoo ;-) And like you it was the reason for me to come here and ask. So I send you a virtual hug. However, I cannot complain about getting something wrong. I got what I paid for. A "horribly bright" green laser, labelled "<50mW" and I guess it certainly is. I have no reason (and no...

You woldn't put a loaded and unlocked weapon into your pocket, would you? You would have a good chance to shoot off your balls. I can see the point in having an on/off switch when in use, but for stowing away - even for transport - you should take out the batteries and put it all into a sturdy...

An interesting idea. I got a set of cheap goggles in three colors. Dark-red, light-red and green. I skip the green one, as the green beam passes right through it, as one might expect. Laser: 532nm, labelled < 50mW, unmeasured. shot in bright light without filter. This shows my "light red"...

You can't. It does not cost you a fortune, but compared to your new posession everything is expensive. These instruments are not rocket science (other than the Laser itself). It boils down to absorb the entire light (i.e the surface has to be mighty black) and to transform this energy into heat...

I could not think about a good reason why this diode should die before doomsday. It has no mechanical wear, no moving parts. You are just juggling electrons between energy states what does not seem to wear them off in the last 13 Billion years either. The only thing that can happen is a slow...

We just have almost the same question here. You want to apply copper to the pcb by means of this Laser, not to remove it? Sounds interesting. How does one do that? Cover the bare board with a copper containing coating and then „burn it in“? What kind of device do you utilize to „paint“ the PCB...

What application do you have in mind? Any decent green pointer goes all the way to the horizon or into space on a clear day. 100mw should be enough to light up a cloud above you. If it‘s the beam that should be seen from far apart, then clear mountain air in winter for instance is no good medium...

Maybe you don‘t need a professional spectrometer. With just a cheap grating (a dollar on eBay) and a ruler you may measure the wavelength to about a Nanometer with a good beam quality. You can try with a spare DVD-R, but you should check track density with a known wavelength. There are quite...