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Historic story since I haven't posted in a while and this occurred in 2015. I was using a 100mW 405nm to charge a section of an object 3D printed with glow-in-the-dark filament. Sounds fun, right? I had suitable eye protection available but I wasn't wearing it on this occasion "as it's only...

3.2W didn't seem enough, and I had to keep the work piece quite close to the lens. This upgrade seems to have done the trick though. Here's What Lockheed Martin's New Laser Gun Does To An Old Ford Pickup

Hi I'm looking for a constant current driver that can be switched on/off quickly and won't spike an M140 diode for an engraver/cutter project. Size of driver not an issue - any recommendations?

Fatty acid methyl esters in a tequila bottle :)

Re-fuel Every 100 Years With the New Thorium Car Any thoughts? :D (Yes I agree, that's a nice looking host, but my Utter Bollocks Detector is off the scale!)

This is from my 70mW 532nm. Normal photos of the beam show the green quite clearly but the orange here is so bright the green barely shows in the exposure. The liquid is 120l of fatty acid methyl esters (aka biodiesel) derived using a potassium catalyst - if it was sodium I might have...

Found this in the news, really sad story: Austrian boy partially blinded by laser pointer - The Local Possibly an over-spec pen, his dad must feel awful :(

At Hak's suggestion I'm posting a welcome - hello :) I first played with pointers back in the 90s when they were only available from specialist electronics retailers in kit form (little more than a module with focusable optics and a plastic box with switch for batteries, and a small regulator)...

I bought this: 1 X ULTRAFIRE LITHIUM RECHARGEABLE BATTERY 3.7V 18650 - 4000mah FLASH LIGHT UK | eBay It claims 4000mAh. When it turned up it was suspiciously light. If I fully charge it with my NiteCore D4 and discharge test it with a Turnigy Accucel 6 it only produces 500mAh before its out...

I've ordered these googles: Portable Protection Goggles Laser Safety Glasses Green Blue With Velvet Box HC | eBay ..but I don't understand what this line means: Attenuation: (10-6 < N% < 10-4). I was hoping someone could help by explaining this. OD5 and OD6 I think are powers of ten, so...