NUBM44 blue- New Video

[Laser57]

Yes, they make the beam fatter but the result is the beam spreads slower as it travels away, the more the beam is expanded, the lower the divergence and further the "throw", if you want to borrow a common term used in the flashlight world. Expanding the beam by 2X (no matter where you start from) reduces the divergence by 1/2. Expand 10X and the divergence is reduced to 1/10 of what it was before. If I knew the divergence of the beam at a specific beam diameter, preferably the fast axis, then I can use that information to get an idea of how much the divergence would be at X expansion.

For example, if the divergence was 1.5 mRad at 3mm diameter it would be .75 mRad at 6mm diameter. There are practical limits to how low you can go and I'm a long way from being an expert on this, but you would have to expand the beam a very large amount to bump up against them, larger than you would probably want to afford due to the cost of large lenses. I've expanded my VIS laser beams by as much as 12 inches diameter and no problem, but I was using a precision surplus lens.

I think Planters video says the divergence of the NUBM44, but I can't play the video or go to the web site with the restrictions on my internet where I am at in Afghanistan. Just my employers restriction, nothing more. I've looked through page after page of posts about that diode in this forum and another popular one and no one actually posts their findings. Well, I can't really say that, but I can't seem to find it.

[Nii]

I watched the video but don't recall.
Get yourself the Tor browser, https://www.torproject.org/projects/torbrowser.html.en
It's Firefox with proxy automatically set up. I have the same issue with some sites blocked and it works for me.

[Laser57]

I haven't been able to watch the video yet, but I just received a PM the beam can be 2 inches wide 15 feet away when using a G2 lens, even if using 6mm as the starting diameter, which is the lens size, that would mean the divergence of the NUBM44 is close to 10 mRad with that lens, OMG is all I can say about that.

[Nii]

In the video ( 11:14) it says the beam is about 6x4mm at about the distance where your scanners would be. There are scanners that could fit that and bigger.

But to get to that size prisms and telescopic lenses are used it seems. What is the resulting divergence I don't know. But if it was too terrible would people here be considering using it in their projectors here?
With PBS you would get around 12W blue at around 6x4mm beam size. If you wanted to go around 20W or more, you could stack two pairs but then need to buy expensiver scanners with even bigger mirrors.

Do we have a better option to get 20W blue beam? Well I think you'd need around 6 NDB7875 diodes to get the same power. I don't know if you could stack as many and get a smaller beam profile. Some commercial 20W blue modules claim a 6.5mm x 6.5mm beam and only 1.5 mrad divergence ( http://goldenstarlaser.com/index.php...product_id=451 ). But is it accurate? Beats me. Judging by the size of the module there have to be several diodes used. Never had a chance to see the insides of modules at this power level. Perhaps they stack dozen of low power blues.
But this is above my expertise. Planters and others can answer whether NUBM44 is a good option or not and what the divergence will be after cylinders and telescopics.

[CDBEAM]

Good grief !!! Screw the NUBM044E....It is a "Divergence Dog"....( Sorry Terra !) Go with a quad NUBM07E....Knife it....then WP one set....then cube it !!....then slam it thru a set of 6X Cylindricals.... No telescope BE.....and I bet the NF will fit on a slightly larger set of scan mirrors !!! What ya loose on raw power will be more than compensated for by relative luminosity !!! oh........and the NUBM044E deserves a Donk on it !!
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Beam out

[Laser57]

I like that idea better, with the longer wavelength the beam will be brighter, when comparing mw to mw and if you knife edge combine them, you get the power back to boot. Build me one!

[Nii]

Go with a quad NUBM07E....Knife it....then WP one set....then cube it !!....then slam it thru a set of 6X Cylindricals.... No telescope BE.....and I bet the NF will fit on a slightly larger set of scan mirrors !!! What ya loose on raw power will be more than compensated for by relative luminosity !!! oh........and the NUBM044E deserves a Donk on it !!

Any ideas of what the divergence is for that diode though? From pictures there's obviously a difference but not a huge one
http://s944.photobucket.com/user/Las...et0xe.png.html

Few issues I see here,
1) It's pretty expensive per Watt compared to NUBM44
2) 465nm is about 1.38x brighter than 450nm sure, but on the other hand shorter wavelengths actually dim after shorter distance. So does a lower power beam. 532nm is 8x brighter than 445nm, the beam doesn't travel 8x more though.
3) 465 is pretty close to 520nm, is it really a good color balance?

Just some thoughts, the cost of 4x of these diodes is nowhere cheap, plus you need 2 more housings, collimators and 2 more mirrors and mirror holders, I think we should take these into account before going with it.

[jors]

465nm is pretty nice, I have several 07E here. However you shrink a bit colour palette because deep blue is lost.
You can get 445-482-520 range apparent colour just balancing the mix with 445nm and 520nm. And, if you match divergences well, you can get near perfect colour overlap due diodes are very close in specs.

[Laser57]

From what I've seen, the 07E has 1/3 the divergence of the 44E.

[Nii]

You can get 445-482-520 range apparent colour just balancing the mix with 445nm and 520nm

You mean adding a 445 diode to the mix to make the beam slightly deeper blue? Sure, although you need to buy another diode, driver, housing and collimator, optics and an expensive 445reflect/462pass dichro, so it depends on your budget.

From what I've seen, the 07E has 1/3 the divergence of the 44E.

I've heard that before but NDB7875 vs NUBM44. Guess the 3-3.5W blue spectrum diodes are pretty similar.
Here's the pic of 07 vs 44: