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Somehow this topic keeps cropping up recently... as I keep mentioning, I'm running my PHR@120mA in an Aixiz without further heatsinking, and the module warms up only slowly when it's on. No problem running it for two minutes or so, and I don't really feel the need for more so far. The red LPC...

PWM would be nice for having a dimmable laser...

@Ways, don't you know that it's always a completely different matter if you do something to others, as opposed to having them do a similar thing to you? :p Btw, cool avatar... what is it?

Good thing my lasers don't know that. 'Cause all I've got for a heatsink is the Aixiz, and they're running fine since a long time. Sure, I can't leave them on for minutes on end (especially the red), but I don't need that. The Aixiz module IS a heat sink, just not a very good one. However, I...

BeO is classed as "very toxic", which to someone working in e.g. a chemistry lab is nothing unusual. There's something called a HMIS-rating (Hazardous Materials Identification System), where BeO has a Health rating of 3 (serious hazard) - top is 4, severe hazard. It's dangerous, yes, but there's...

I once happened to run my LPC at >600mA as well for a while; somehow the pot on the FlexDrive got moved. I noticed the unusual brilliance and that it got rather hot within seconds (I have no extra heatsink, just the Aixiz). I've been running it like that for maybe a few minutes before...

Well... yes and no. See this thread, particularly starting at post #13. The problem with OD alone is that it doesn't tell you how long the glasses can withstand a direct hit before burning through. Some more info on that here.

You can be quite sure that the chinese are not giving anything away... LCD+parts+labor+shipping+profit=price

There's no direct correspondence. Linearity and resolution would be more relevant. At that incredible price, I wonder what one can expect... A few years ago, I bought in-ear headphones - supposedly the real Sony Ericsson stuff - for my mobile for about $17 in current value on ebay; they had...

There is no 98% efficiency DC-DC converter. I've read lots of datasheets and they claim up to about 85%, but that is dependent mostly on Vin which needs to be around 3.5..4V for peak efficiency (you should be close to that with your battery). Again, if you're measuring the current between...

@daguin - I wasn't suggesting that they're really PHRs being sold as GGWs. I thought about it for a moment and also decided that they'd give out higher power at that current if they survived at all. @Flaminpyro - I don't quite see how exactly you're measuring the current. If you're measuring...

Hm, from what I've heard, you need a considerable amount of force to insert the diode - from engineering drawings I've come upon it seems that the diameter of the mounting hole in a module is 0.1mm less than the diode rim diameter (which has several indentations around the rim so that it can...

Isn't the usual figure for a measly PHR given as ~100mW@120mA with Aixiz acrylic? 150mW with a 405-G-1 lens is little above that. I've read in another post that the recent available GGW batches seem to be weak, maybe they're different diodes from the original brand?

Well, "aunt" doesn't mean "old"... except in the sense that to a 19-year-old, 25 may feel old :p

Commercially available achromatic (or even better, apochromatic) lens systems are for use in visual telescopes or cameras, so they wouldn't be optimal for the 405nm/660nm combo (both of which are near the limits of visibility). It would be possible to design a 2-element achromat exactly for...

I've discussed this a bit here. Copper is about "twice as good" as aluminium, taking heat capacity and conductivity into account (take this as just a very qualitative statement). You get the most out of both copper and aluminium heatsinks only if you press the diode directly into them. Otherwise...

You can see the beam only by the scattered light. This is only visible when you're not too far away from the beam, and/or when it's going nearly towards you or away from you (as it is when you are holding the laser), because then the beam looks foreshortened and thus intensified. Neither of...

The same goes for planar and spherical mirrors as well, of course. 1/4 wave is pretty rough. Generally, it's not important if a microscopic area of a mirror deviates farther from the optimal shape. For that reason, you don't specify the maximum deviation but average the error over the entire...

Very good point from Flaminpyro; sometimes trying to be safe can bring woes. Of course any modern house or appartment should be protected by an FI switch, but under certain circumstances even that may not help. Instead of using the grounds on a wall plug, I'd rather connect to the metal on a...

I don't smoke either, but I think he means a single-cigar carrying case which I'd think are made of metal. Why not? As a youngster, I built (among other things) a 5V power supply into a band-aid case...