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Be very careful with the vial if it does come out. If you break it and breath the gas you could get very sick. Technically the selling of tritium in the US is illegal but it's not well enforced, just like importing lasers isn't enforced.:whistle: However, the biological half-life of Tritium is...

Damn!!! I'm luck to get 15mW out of mine after the correcting optics. Although my LPM is homemade and I don't think it's accurate with power levels below 50mW. -Tony

Almost 8 months later, and it's STILL glowing. I have it on my keys and play with it everyday. I was just looking at it just now and I thought of this thread. Haha! -Tony

Yup, but after the correcting lenses it's about 10-15mW with a messy beam. It's worth it if you really love collecting wavelengths. There is no way in hell it can me made into a handheld. The moment you start messing with the crystal internals you'll screw it up. Also you'll need 2.5 volts and...

huge jump between 419 and 420nm. Nice work though. -Tony

This forum is full of little kids. All we can do is advise them. I'd blame their parents if they hurt themselves with their lasers. -Tony

^Yup. After some test with my meter I came to the conclusion that the ambient temp doesn't matter. It was just a thought on my part. -Tony

Huh, I stand corrected. My experiences with them don't hold to what they claim on that data-sheet but I suppose they will work. However, since they're only 1.5v the total will be 3v. I think the Flex drive need at least 2.6v or something like that. That gives you less of a "V-drop range" for...

Interesting proof of concept. Do you have a actual LPM to compare results? If you know the efficiency, you can account for any error and actually be accurate to within 10-20mW I'd guess. I'd also recommend using a metal will a LOWER specific heat. With a lower specific heat the metal will take...

Forget the g-1 You should consider current delivery rather than capacity. I'd say use the single Li-ion. Those Energizer or Duracell 1.5v lithium cells may have far more capacity, but their internal resistance is greater. That means that the voltage will drop as you try and draw alot of...

Not for the diode, for the driver. The flexdrive has an efficiency of around 93-95% at best. That may seem really good but if the diode is getting like 4 watts of power then the driver is dissipating upwards of 300mW of heat. That's alot for a unheatsinked component smaller than your fingernail...

The problem isn't that he's showing kids how to make lasers. Shit, 12 year olds nowadays are smart, and this forum is full of them. If kids want to make lasers they're going to. I think I was like 14 when I made my first powerful laser. The real issue is that he doesn't mention safety, at all...

Yup. Any higher would be too much for a handheld IMO. -Tony

My first 445nm diode is really inefficient for some reason and only produces about 300mW @ 800mA. I built another, also at 800mA, and this one puts out about 900mW. I can tell you that there IS a difference. The beam is about twice as noticeable. The dot is twice as bright. -Tony

LOL, I may have to try this. But one of my 445nm builds only does about 300mW. Maybe if I use my 900mW 445, 300mW 445, 250mW 650, and 260mW 405 all together it'll work. -Tony

You're either 13 or 31. :D -Tony

Thats what I used and it works great!!! The reading will take about 10-12 seconds to stabilize when measuring my 950mW 445nm. That's actually really good. The bigger the plate is the longer it will take the laser to heat it up. Which means it will take more time for the thermal difference...

Same here man, and I've been on LPF since 08. However I've been interested in lasers long before I came here. But it was his DVD mini mag light hack that brought me here. Before that I never knew there was a red laser diode in DVD burners, I always thought it was IR. Nor did I know you could...

The moment I saw this on You Tube my first thought was LPF is gonna be all over this. And look.... LOL -Tony

Actually thats been their for a while. -Tony