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Old 03-17-2017, 05:34 PM #1
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Default How hard to find a NUBM44 that hits 455nm or higher?

I read a thread about combining two NUBM08 of slight variation using a blue/blue dichro.

This got me thinking about trying the same with a pair of NUBM44s.

2 pairs of NUBM44s PBSed x 2 dichroed and you have up to 28-30 watts all on the NUMB44 beam profile.

Add a beam expander and you could do really long distance burning.


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Old 03-17-2017, 05:43 PM #2
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Default Re: How hard to find a NUBM44 that hits 455nm or higher?

I would love to see someone do that! I wonder how much the wavelength can be varied by running two of them at high current, the other two a bit low.
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Old 03-17-2017, 06:32 PM #3
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Default Re: How hard to find a NUBM44 that hits 455nm or higher?

I bought a dual 044 hand held off Rick Trent. I did small review here on the forum, the links at the bottom, it's a heck of a build. But two pairs of 044's would be something "off the charts" best wishes with your idea 10-12 watt 450nm review
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Old 03-17-2017, 07:10 PM #4
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Default Re: How hard to find a NUBM44 that hits 455nm or higher?

I whipped up a quick layout of a tidy array based on the dimensions of off the shelf parts.



It is as close to scale as I can figure.

It would fit nicely into a sink for a maglite for a portable build.

They could also stack side by side very tidy for a knife edge array...
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Old 03-17-2017, 07:16 PM #5
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Default Re: How hard to find a NUBM44 that hits 455nm or higher?

Quote:
Originally Posted by AaronT View Post
I whipped up a quick layout of a tidy array based on the dimensions of off the shelf parts.



It is as close to scale as I can figure.

They could also stack side by side very tidy for a knife edge array...
The pcb cubes that Rick used are noticeabley larger and since they are used for cooling and do get warm in 30-60 seconds would be concerned about run time with 4 of them with smaller heatsinks?? Still like to see it done.
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Old 03-17-2017, 07:23 PM #6
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Default Re: How hard to find a NUBM44 that hits 455nm or higher?

For something like this I picture more using quick bursts rather than running due to minimal heat sinking.

It could always be built bigger with more sink with less difficulty.

Due to the BTUs involved, I think it would be a great candidate for a constant on liquid cooled unit. Would be lighter than trying to put enough sink and cooling fins and fans on it.
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Old 03-17-2017, 07:33 PM #7
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Default Re: How hard to find a NUBM44 that hits 455nm or higher?

Quote:
Originally Posted by AaronT View Post
For something like this I picture more using quick bursts rather than running due to minimal heat sinking.

It could always be built bigger with more sink with less difficulty.

Due to the BTUs involved, I think it would be a great candidate for a constant on liquid cooled unit. Would be lighter than trying to put enough sink and cooling fins and fans on it.
Hey, I game!! Think it's a great idea. I talked to Rick about 3 months ago about building a 4 diode unit but it was just talk, so if your going to go for it, hey I'm all in !

Liquid cooled? Now that's s interesting idea
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Old 03-17-2017, 07:40 PM #8
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Default Re: How hard to find a NUBM44 that hits 455nm or higher?

Hell, that is a small pointer by my standards, even if 2 inches across the head, not big. 3 inches or more is my liking so I can put a huge lens on it, the mRad of those diodes is about 12.5! Huge, needs at least 2 inches of expansion, better 2.5". Then make it focusable so you can get a small point for burning.
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Old 03-17-2017, 07:46 PM #9
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Default Re: How hard to find a NUBM44 that hits 455nm or higher?

Could always try and temperature tune them to the right wavelength, although you'd likely need a temperature difference of a good 50C and binned diodes (already having a notable difference in wavelength) to make it work.
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Old 03-17-2017, 07:55 PM #10
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Default Re: How hard to find a NUBM44 that hits 455nm or higher?

Yep, temperature tuning is the only real way of manually adjusting the diodes wavelength. Although I don't recommend doing it on these as they can already get hot, and could end up exceeding their max temp if not too careful. 5nm isn't worth the risk of overheating your diode. That's what the 465's are for. Otherwise you just get lucky and receive a higher WL diode.
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Old 03-17-2017, 08:02 PM #11
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Default Re: How hard to find a NUBM44 that hits 455nm or higher?

Quote:
Originally Posted by CurtisOliver View Post
Yep, temperature tuning is the only real way of manually adjusting the diodes wavelength. Although I don't recommend doing it on these as they can already get hot, and could end up exceeding their max temp if not too careful. 5nm isn't worth the risk of overheating your diode. That's what the 465's are for. Otherwise you just get lucky and receive a higher WL diode.

Run one hot at 30C-40C and run the other cold at -20C.

Be a real pain to do that in any sort of portable form factor though, if not impossible.
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Old 03-17-2017, 08:11 PM #12
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Default Re: How hard to find a NUBM44 that hits 455nm or higher?

Ha, yes true. That would be a right pain to do. Frozen on one side whilst hot on the other.
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Old 03-17-2017, 08:17 PM #13
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Default Re: How hard to find a NUBM44 that hits 455nm or higher?

I'd suggest knife edging to eliminate the wavelength problem all together, but I love coaxial beams where they fall on top of one another so much more. I suppose that is the easiest way to go, but now you have four beams, and due to my desire to reduce the mRad down to no more than 1.5 mRad for that diode, I am not sure how well four beams can be expanded into one, anyone? Can a single PCX lens collimate four beams which have been expanded to overlap on the lens, or would that make a very weird beam?
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Old 03-17-2017, 08:20 PM #14
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Default Re: How hard to find a NUBM44 that hits 455nm or higher?

I have seen it where many beams have been expanded into one but in reverse. For it you need to have two lenses. Here is an extreme case (LPF Member: Gryphon):

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Old 03-17-2017, 08:28 PM #15
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Default Re: How hard to find a NUBM44 that hits 455nm or higher?

Telescoping the beams together makes them look more like one beam, but it won't help the divergence, for this diode, I'd have to expand the beam quite a bit, it's already high enough, telescoping the beams together smaller would just increase the divergence even more. I don't think I am telling you anything you aren't probably more schooled in than I am, but thought I'd mention it for the others who might consider this approach. This diode is almost as bad as the output of a infrared FAP laser, the light becomes a rake very fast, unless focused down to a spot, or expanded.
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Old 03-17-2017, 08:34 PM #16
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Default Re: How hard to find a NUBM44 that hits 455nm or higher?

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Originally Posted by Alaskan View Post
Telescoping the beams together makes them look more like one beam, but it won't help the divergence, for this diode, I'd have to expand the beam quite a bit, it's already high enough, telescoping the beams together smaller would just increase the divergence even more. I don't think I am telling you anything you aren't probably more schooled in than I am, but thought I'd mention it for the others who might consider this approach. This diode is almost as bad as the output of a infrared FAP laser, the light becomes a rake very fast, unless focused down to a spot, or expanded.
This is what is pulling me to the 30 watt culminated beam and an attachable 10x expander.
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