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If you have a proper mains powered laser it should output a constant amount of light and be able to run indefinitely so you can switch between several meters without ever turning the laser off... and if the power is not constant you should see that when using the same meter again during testing...

That could be a way of repairing the diodes indeed, but it doesn't really answer the fundamental question: what are these enclosed laser diodes filled with to begin with, and why? I think it would be mostly against dust, but perhaps also against oxygen or water vapour, though there are plenty...

If you were somehow to hermetically re-seal these diodes that'd all be worth trying. It doesn't really answer te question of what was in there in the first place, but it could rule out what the problem is: nitrogen, oxygen, water, etc? The problem would probably re-sealing them though: how do...

Nice build - not to sure you could call it portable but at least luggable or unreliant off mains power. The arduino control over the whole system is nice. Given how many anlog inputs that has, you can monitor not only the laser temperature, but also things like their actual current and...

I think it's mostly dirt/particlates at this point though. If oxygen would be the thing killing these diodes it doesn't really make sense on how long they actually last when exposed to air. It's hard to tell though, these laser diodes are so small it would be very difficult to get a sample of...

It's all a bit confusing really. I reckon the G just stands for glass, which is good since they will not melt at high power. But there are other factors, like the anti-reflective coating on these lenses, which can be optimized for a particular wavelength. The optimal wavelength of the coating...

It's not lag as such. These DPSS lasers average out rapidly changing power levels of 808 nm light going into then, and the actual solid state laser makes them too slow to transmist 38 kHz signals. Any LED or direct lasser diode would have no problem with this, probably you can modulate those...

The problem is using DPSS here. These things do have a lag in both turning off and on between electrical input and optical output. This already gives notable issues when scanning at 20 kHz or so, but you can compensate for that in software by delaying the movement of the galvo's and power up...

I think it would be common knowledge that takeoff and landing are the most dangerous parts of a flight. This doesn't really have much to do with lasers fundamentally, if you have enough altitude you can always trade that for speed even if the engine(s) stop working entirely, regardless of...

Amazingly you can do this with a very affordable laser yourself :) It's not the same as what is used in biology and such though: You can move around particles of soot and apparently even diamond powder with a cheap laser, demonstrating the effect. With things like cells you don't want to use...

Good to hear, the one i have is of excellent construction standard and would certainly be something i'd recommend in this price range.

Also it isn't really that feasible anymore. We used to have the 532 nm dpss lasers mainly, and you could treat the windows to reflect that exact wavelength, though only at a certain angle. You cannot protect against things like 630-660 nm ranges though, that would make it impossible for the...

Another good choice could be the Hyperion series of lpm's, built by forum member Astralist. I'm not sure if they are still available and in what varieties, but i certainly like the one i got.

I agree with Paul on this one - on a matte surface the reflection/dot is just a more or less omnidirectional light source from that point, and usually not that dangerous unless you are very close to it (danger reduces with distance squared, so the ceiling is usually fine as long as it is matte).

It's not anger at all, for the dummy load thing i just know there is so much info on here you can find it if you know what terms to search for. And there is nothing wrong with asking a question: people may say 'use the search' but that would presume you know what you are looking for. If you've...

You could indeed since thermal conductivity is limited. But i would like to point out that you could still melt a hole in a cube of copper with fans blazing at it at 500 mph and fins engraved all around that cube, and that wouldn't make it that much more difficult to do. The issue is that with...

Look around the forum for 'dummy loads' - that'll explain what you need to build if you want to test a driver without putting an actual laser diode at risk. A lot has been written on this topic so i don't think it would be useful for me to repeat that here.

The problem is with -inert- , which is a relative term. Air can be considered an inert gas to many substrates: most things we use in everyday use do not catch on fire when just exposed to air, and hence air could be considered an inert storage medium for something like a wooden table at room...

Not wanting to use DHL can have it's reasons... For me, for example, when DHL tries to deliver something when i'm not at home means i'll have to collect it from their depot, halfway across town. In moderate traffic that could take me an hour or so to do. Using the 'regular' postal service /...

Well yeah, if you've been working with electronics a lot you know that the TO designation number does not reflect the diameter in mm or something like that... but to someone new to the hobby they might very well think so, especially since TO-56 is 5.6 mm diameter and very common for laser...