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Old 07-19-2014, 10:16 PM #1
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Default Angel breath:7.6W+ dual NBD7A75 fan cooled portable.(Pic heavy)

Hey guys,

First I want to say this build has been crazy. I have been planning it for at least 3 months. I'd like to thank several members here that helped me Jander6442, ARG, Cyparagon with alignment issues.
Mcrouse for the machine work.

Without further ado I introduce you to build I have named Angel Breath because it burns anything you put in its way! Two fan cooled lab modules from Techhood, 2X NDB7A75 diodes. 3 stainless steel tubes, Aluminum plate cut into 3 brackets to space the tubes/add support.
Mcrouse machined AL adapters to press fit into the tubing to thread his tail caps on.



The laser unit(if I may call it that) is Lightweight, structurally sound and Relatively ergonomic. However I never intended it to be small.


Lets start at the beginning
I tried to keep the design simple, unique, powerful, and functional.
The three tail caps: one for each laser and one for the fans. I ordered the diodes from DTR with the option for 3.5A drivers and G2 lenses. Copper pills from survival laser were epoxied in the tubes that fit 2 Efests 18650s. Whip up some battery contacts and here we go.


Next come the fan cooled labbies from Techhood:
One of the first problems I ran into was the rectangular labbys didn't accept the 12mm copper modules. I took the module provided and had it machined at a local shop and tapped with a set screw.


Arctic silver 5 FTW


Next I squared the these up and soldered the connections. The fans are connected in parallel and run off Four 3V disposable 123s to provide 12volts. I could have probably made a quick drive circuit and used lipos but this seems to work fine. Don't mind the mess


Optics
I ordered the waveplate & cube mount from Stanwaxlaser. The mirror mount and dichro from Newport. Yesssss I accidentally ordered the wrong cube mount but I refuse to dump anymore money into this build.
The hardest part was orientating the mounts and modules. It still could use some adjustments but I believe it's ok. The waveplate is actually glued to a threaded fitting that makes it easy to rotate.

In this photo I tacked the rectangular heatsinks with hot glue but later thermal epoxied them down to the aluminum plate. The hot glue has since been cut away.


Time to build a wire frame and add support.
The drivers benefit from this fan cooled system. Interesting to note the super small fans take 1m16s to warm up to full speed. I consulted an electrical engineer friend and he said this is normal and not to push these brushless motors. Admittingly I don't know much about them but I know at 12V they draw roughly .08A. They seem to be very effective.

Fire it up!
I have the option of turning on one laser at a time. It's hard to tell how powerful this laser is but each Individual laser soars very rapidly and tops out my LPM at 3891mW, at that point I turned the laser off in fear of ruining my radiant X4. The sensor was positioned 4 feet away because at this point I didn't want to defocus the alignment set to infinite. @ 4 feet the divergence was slightly smaller than a centimeter. That lighter beam exiting the cube...no matter how I position the wave plate or modules the lowest power I could achieve was 49mW each.


The tinted shroud is to contain the bright light given off by the optics.
Conclusion
I consider this build 90% finished. It's a bit bulky and not the most beautiful but I like it so far ahh It was a challenge indeed. I maintain a beam profile that resembles a plus sign+. Soon to come I will try to get some outdoor beam shots and a burn video. But for now this will do. I might update this thread periodically as I make adjustments. I think it's Conceivable this laser puts out over 8Watts but I cannot confirm that.
No doubt about it this laser Incinerates. Steel wool and wood from 10+ feet away I accidentally discovered.

Thank you everyone!
Jefferson

(No eye balls or pets were hurt in the making of this laser..except some furniture)


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Old 07-19-2014, 10:25 PM #2
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Default Re: Angel breath:7.6W+ dual NBD7A75 fan cooled portable.(Pic heavy)

Congrats on your portable firestarter for next time you're out camping.

cheers,
c
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Old 07-19-2014, 10:26 PM #3
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Default Re: Angel breath:7.6W+ dual NBD7A75 fan cooled portable.(Pic heavy)

Awesome. That thing is a beast.
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Old 07-20-2014, 12:01 AM #4
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Default Re: Angel breath:7.6W+ dual NBD7A75 fan cooled portable.(Pic heavy)

maybe I should add a shoulder strap. Haha shoulder fired laser..
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Old 07-20-2014, 12:09 AM #5
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Default Re: Angel breath:7.6W+ dual NBD7A75 fan cooled portable.(Pic heavy)

I have never been much for big lasers but this thang is a killa! I look forward to the burning video!

Good job and a +4 for a great read!
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Old 07-20-2014, 12:31 AM #6
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Default Re: Angel breath:7.6W+ dual NBD7A75 fan cooled portable.(Pic heavy)

It's quite a big laser. If I ever decide to disassemble it can be easily done. Something I considered was using the platform and swapping out one of the 445s with my 1W 520. I'd remove the cube and put another optic in its place.
For right now I don't want to tamper with that NDG7475.
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Old 07-20-2014, 01:40 AM #7
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Default Re: Angel breath:7.6W+ dual NBD7A75 fan cooled portable.(Pic heavy)

wow. that twisted trim looks great. very impressed.

mac is thinking what im thinking. laser rifle all the way man.
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Old 07-20-2014, 02:30 AM #8
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Default Re: Angel breath:7.6W+ dual NBD7A75 fan cooled portable.(Pic heavy)

Quote:
Originally Posted by madmacmo View Post
Or even this bullpup kit:

SKS Bullpup Kit.. plus Tapco-T6

Don't get me started, I saw an FDE Tavor today at the gun store. Sks options are always cool.

Beam shots next to a 2.7W 445 build.
I have to darken that shroud. It's distractingly bright outdoors.


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Old 07-20-2014, 03:26 AM #9
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Default Re: Angel breath:7.6W+ dual NBD7A75 fan cooled portable.(Pic heavy)

Nice build man! Better watch out the government might be coming after you...
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Old 07-20-2014, 06:07 AM #10
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Default Re: Angel breath:7.6W+ dual NBD7A75 fan cooled portable.(Pic heavy)

I know why you named it Angel Breath. Sitting on the table facing up it looks like a light
fountain. It lights the whole room and everything fluorescent glows.
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Old 07-20-2014, 01:09 PM #11
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Default Re: Angel breath:7.6W+ dual NBD7A75 fan cooled portable.(Pic heavy)

Man what a beast, You definitely hit the home run with this one Jeff, 2 labby's in a handheld!
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Old 07-20-2014, 04:21 PM #12
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Default Re: Angel breath:7.6W+ dual NBD7A75 fan cooled portable.(Pic heavy)

And you bring out the big gun....

Impressive build. I agree, it's in need of being made into a full rifle.

I kind of like the glow, but could see how it would be a bit much.

I notice that every time the 7A75 is shown next to the well known 9mm, the 7A75 looks purple. Maybe because it's difficult to drive it, let alone push it..

+rep (when it lets me).
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Old 07-20-2014, 04:43 PM #13
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Default Re: Angel breath:7.6W+ dual NBD7A75 fan cooled portable.(Pic heavy)

This is my theory. It's no doubt the 7A75 is more powerful and indeed very bright but maybe the old 9mm is being pushed harder therefore increasing it's wavelength. This 7A75 isn't being driven at excessive currents.
Nichia NDB7875 445nm 9mm is being driven @ 2.4A
Nichia NdB7A75 9mm is only being pushed .5A passed it's recommended setting.

It hard to compare different diodes of course but maybe this has something to do with it.
This current pushing for wavelength is true in the case of the NDB7675
My thoughts only.
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Old 07-20-2014, 04:52 PM #14
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Default Re: Angel breath:7.6W+ dual NBD7A75 fan cooled portable.(Pic heavy)

That's what I was thinking as well. The 7A75s, so far, have been driven right about at spec or a little under. They may actually be close to their rated wavelength, while the 7875s are likely shifted higher.
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Old 07-20-2014, 07:10 PM #15
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Default Re: Angel breath:7.6W+ dual NBD7A75 fan cooled portable.(Pic heavy)

Very innovative Thanks for sharing. +REP
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Old 07-20-2014, 07:59 PM #16
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Default Re: Angel breath:7.6W+ dual NBD7A75 fan cooled portable.(Pic heavy)

Man what a powerhouse!!! Sweet build and excellent picture story, be careful not to burn down the house. :>)

Talking Heads "Burning Down the House"
https://www.youtube.com/watch?v=xNnAvTTaJjM
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