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Actually the brightness would not increase one bit, it just would be distributed differently.

What exactly is your problem? It's most probably a PHR with a 405nm glass lens in a lighter. Apart from the odd host, it's nothing that's in any way remarkable.

Well, 3.2W is far less than the amount of sunlight you get on your palm if you hold it out into the sunlight. It's not a great amount. Laser pointers of a few dozen mW are dangerous ONLY because the eye focuses the energy onto a spot on the sensitive retina with a diameter on the order of a...

Momo, just a short while ago you arrived here completely clueless and now you try to pretend you're the big know-it-all. Not a good move. Of course a laser diode (any diode) has a limited current. This can be seen from the fact that in a U/I-diagram, the curve isn't vertical after reaching the...

Still, he doesn't want the stuff for himself, but for resale. That's speculation by anyones definition. And the "worth more" depends on the market - I wouldn't take the stuff for free. There are people here in this forum who might be interested - I'd say the best thing would be to contact them...

Ah so. First, make sure that the contact points where you put your probes are clean. The threaded part may be anodized, try sanding it a bit and retry. Make sure you use a fresh battery for that. Failing that, I'd consider a (reverse-voltage protection?) diode somewhere in the circuit. I've...

1/4 W is standard. These are good for up to 500mA (at 1 Ohm).

1. Yes. 2. According to scopeguy20, they're very good, often over spec. Sometimes he resells some of them, in case you're interested in having a metered one. Contact him.

E.g. here

Regarding T_J, there are probably some people here who share your sentiment, according to some recent threads... I can say from the time I've been here on the forum, that every shop newcomer gets a very rude treatment from some high-profile members; and some do seem to have strange...

A primary CR123 with less than ~2.6V under load is dead, plain and simple. Measuring the voltage without load is pretty meaningless. If it shows less than ~2.9V under no-load conditions, I'd chuck it as well without further ado.

Alex: would work, but only for a red LD, since the dropout voltage of the driver is ~3.0V (LM317) resp. 2.4V (LM1117), taking the current sense resistor into account. Vf of the LPC-815 diode is about 3.4V (400mA) resp. 2.8V (250mA). The batteries would sag to 2.8...2.9V under load.

"Daylight" covers a lot of territory. If you mean outside in sunlight, simply forget it. Inside without artificial lights, ok. But don't expect a solid green bar (as in comics). Visible in daylight is barely visible. EDIT: unless you've got a high amount of air pollution!

Added myself, no problem at all. If it doesn't work for you, your PC probably isn't up-to-date or in need of a registry clean/repair. The map needs the FlashPlayer.

To summarise: for "our" typical lasers this means laser protection goggles with rating D L5 (EN 207).

PM = Private Message. Click the "Your Notifications" link on the top right. You got mail. You should never invest in something you don't understand. That's just gambling, and you'll probably lose.

I don't know what exactly they teach at this "Photonics Engineering and Research" college course, but as an education, this sounds far too narrow and specialised to offer any great opportunities. I guess most companies would fill such a position with a real physicist or engineer with some...

Ouch! :twak: Lasers as weapons were researched for SDI (Star wars defence initiative). CW lasers are useless, period. In air, any power large enough to cause damage would heat up the air so much that the beam becomes scattered after a very short distance. Even in space, where you'd be shooting...

You could also use 10 1ohm 1W resistors in series (or other values in combo serial/parallel setups), if that's an alternative...

That may be. OEMLasersystems sells "Laser protective eyewear", would you make fun of them also? To me, the wording is perfectly normal and understandable in both cases. "Vision enhancement", on the other hand, is definitely wrong, as vision is not enhanced at all - just the visibility of the...