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Getting two incoming beams to have orthogonal polarization can be as simple as rotating one of the diodes about its axis - depending on the diodes. IIRC Rick Trent has been using cubes for dual diode builds like this: 6w dual diode 445nm laser kit most powerful handheld 445 in the world right...

Yeah - it sounds like you aren't able to get the collimating lens close enough to the emitter. This could be due to the diode not being pressed completely into the module, mucked up threads in the front of the module/back of the lens barrel, or possibly a g-2 lens that is not close enough to...

You could send it out to have it measured by one of the members with a LPM, which is really the only way to know if it is up to spec. But if it does what you want it to, then maybe the power isn't really important to know. It is obviously powerful enough to be a hazard to your vision, so make...

AFAIK dichros only work to combine beams of differing wavelength. If that's not the case, somebody please teach me. I won't be canceling my order of 2 of these regardless, because I can find other uses maybe for an interferometer or holography setup, but I like to know as many ways to do...

I'm a newcomer myself, but let me be one of the first to welcome you to the forum and say "Hi". Some searches for engraving or cutting bring up several threads, so there does seem to be some info here. What isn't here already, you can share as you learn more from other sources. Here's wishing...

Newport has some excess stock visible AR coated pbs cubes marked down from $350 to $25 through July 7th 2014 or until they are gone - here: 5811. Would be a nice grab for dual diode builds (who doesn't want to see a 3W 520nm?) They also have several other deeply discounted optical...

After recent purchases from Survival Lasers, DTR and Flaminpyro, I have to say that I am very pleased with the responsiveness of these sellers as well as the quality of their products (SS host and driver/pill from SL , diodes and optics packages from DTR, and a couple of drivers from...

I'm not going to be one to say it's impossible, but I think the info you need for your best shot at this is in another thread about it that is almost suspiciously similar - here: http://laserpointerforums.com/f49/even-smaller-spot-size-using-mask-89357.html. Holes that small at 10cm might be...

It looks like your diode window got something on it. This can happen pretty easily any time you have the lens out. It could be anything from moisture to dust or fibers or little pits on the window from something that got burned there. I'm not the best one to recommend a cleaning method, but I...

Hello LPF. I have just begun posting around here after a couple months of lurking. I have built a number of laser projects several years ago unaware of the existence of this community and have just gotten back into the hobby after a recent move. I am just as interested in the physics/basic...

I suppose the thermal capabilities of some module/HS/host combination would be best quantified by the ability to keep the diode below some target limiting temperature for a specified time given some ambient condition. This effect is a function of the conductivity,heat capacity, emissivity, and...

Sorry for the double post, but I forgot to ask. Can you take a picture of your spot at that distance to help us determine if it is "normal"? Also, I am assuming you have already read the sticky http://laserpointerforums.com/f65/there-something-wrong-my-beam-spot-59400.html, but if not then...

I stole this image from DTR to use as a reference. When you say the spot/line is a certain width, it's hard to know just what that means. The spot intensity will diminish away from the center, but at what point do you define the edge? For a brighter spot, you may subjectively define the...

I have almost the exact same build in that host. I use the Efest IMR 18350s and haven't felt like my run time between charges is restrictive. I am running a bit lower at 2.2 A, so yours will obviously run hotter, but I have left it on for nearly 2 minutes (I usually limit it to under a minute...

This is indeed quite impressive. Might be a bit large for my taste, but that's just me. Not many actively cooled hosts out there. Nice to see how you have approached it.

That's exactly the idea Badger. Instead of using the very short FL lenses that seem to be common practice here, I am going to try using one with 18mm fl. That will be the only lens I am using. The problem is finding low cost, large, aspheric lenses with a large enough numerical aperture to...

I am fairly new here and certainly haven't read every post on the forum (so might have missed some discussion of this), but I have seen several threads, particularly reviews, that seem like they might be missing a basic concept. I have seen many people gushing about "really great thermal...

Well, that linked thread doesn't seem to be quite along the same lines as my question. Or at least I was unable to find an answer there. I'm not worried about corrective optics at this point, but maybe the astigmatism, rather than the divergence, is the most prominent factor inhibiting...

I think this diode is still new enough that longevity is not yet well defined. Some members may be able to post the specifics of failures they have seen, but nobody is going to be able to assure you that you can get hundreds of hours out of some setup. If you look back a few posts in this...

Milton, what lense are you using currently? Since the beam from the emitter is already diverging, you can adjust the distance to the collimating lens to adjust the distance to your beam waist. If you position a 6mm focal length lens such that your beam gets focused on a plane 10 cm from the...