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I speak German, English, and Slovene, but I have a rudimentary understanding of Russian and French, and I can carry on a very basic conversation in a few other European languages.

While we are totally derailed on the topic of the death penalty, I'll simply mention that the death penalty is very expensive, but it does not necessarily need to be. The argument that the death penalty elevates the power of government too far is a little tough for me to parse with the context...

Interesting stuff, but, most likely, a barrage of junk from some sort of collision or near-collision between star systems.

I've used a Lumix camera before to photograph NIR (980 nm) and UV (375 nm), since the filters they use are not very good at blocking out anything near visible light.

I just watched the videos last night. I do think this was/is an interesting idea, and the science, to me, sounds okay. However, I'm underwhelmed by the execution and the comical level of obfuscation in the videos. I also have concerns over the practicality of the device. I get the feeling...

What's wrong with entertainment and experimenting? I've used mine as a tool to burn oil impregnated paper for QC testing, and to age oil (405 nm is short enough to cause UV damage to petroleum) in highly localized spots that would otherwise be impossible to reach (maybe that'd be considered...

More than a year later, and the H405L-500B is still going strong. I've used it a fair amount. I have done freehand engraving with it, used it to burn oil-impregnated paper for experiments, ionized air enough to trigger a Marx generator impulse, and plenty of "stupid stuff" like seeing what it...

Everyone I've seen has been 1 mW or less, but many of the older ones were HeNe tubes. EDIT: When the grocers went to handheld scanners, these things popped up everywhere. I was moments away from snagging one on at least three occasions. They are a little more difficult to come by now, since...

I haven't heard much about them, but the wavelength is very close to a nice water absorption peak. I've only ever seen 1470 nm diodes at low power, except medical take-outs (I guess they are used for vericose vein removal). I was wondering if anyone here has experience with them. Obviously...

I will answer your questions directly: 1.could the laser be fine and the batteries are fake so that's why the laser is weak and does not do the job? Highly unlikely. As everyone is saying, a 2000 mW 532 nm handheld laser isn't commercially available, especially not for $9. The eBay listing...

That'd be great! One step away from an all direct diode RGV!

Man, this is heartbreaking. If you find this guy listing your stuff in a classified advert, maybe you can get some friends to help you set up an ambush. I grew up in Detroit, Michigan. My parents always had dogs, and we never got hit, even though our neighbours on all sides had been robbed...

Thanks! I wasn't aware that the holder for the optics included the optics themselves. It's difficult to get that from the description.

Looks very clean! Would you mind sharing with me where you got the beam splitter/combiner? Thank you.

I don't know who was responding to my emails there, but the general production email seems to get a response within 12 hours or so. I think that's pretty much as good as it gets with a USA-China communication. I've dealt with companies that were far worse. Maybe the trick is not to deal with...

I just received my shipment from them yesterday. The laser seems to be good quality, and their customer service did everything I requested of them in a timely manner. You have to keep in mind, with Chinese companies, that there is a 12 hour time difference between the Eastern USA and China, so...

Update: I received my SKY Laser H405L-500B today. It uses exactly the same host, has exactly the same stickers, except for the serial number and model number, and this new laser is "night-and-day" more powerful. I did a quick test and I can cut a sheet of white paper in half in a few seconds...

All of my Radio Shack lasers have done this. I, too, believe it is due to poorly made optics/poor alignment of components. There isn't really a good way that I know of to fix it. Just stay away from $30 radio Shack lasers, which are, in my opinion, inferior even to the cheapest eBay pens...

I've had one 532 nm 5 mW pen fail on me, after a few minutes of use, but I believed it to be a driver issue, since the lasing action still occurs for a second or two before it dims and eventually fades completely out. I've had a 405 nm pen mechanically fall completely apart, but the module...

TE Modules aren't usually very good at dealing with tons of heat all at once, directly. I've tried using some pretty large ones to try to cool high temperature components before, and always burned them up. They can work as a component in a liquid heat transfer system quite well, though, but if...