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Old 05-09-2017, 09:05 AM #1
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Default Which Green Diode ?

Very soon I will be ordering a 520 diode from DTR. But which one ?

NUGM01
NUGM02
NDG7475
N520


Any advice on which might be the better choice ?


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Old 05-09-2017, 09:44 AM #2
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Default Re: Which Green Diode ?

My personal favorite is the NDG7475 without a gball lens.
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Old 05-09-2017, 08:16 PM #3
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Default Re: Which Green Diode ?

The NDG7475 would be my choice as well. It has a can with a window and no lens attached to the can, so you can use a G-2 lens.
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Old 05-09-2017, 08:34 PM #4
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Default Re: Which Green Diode ?

Quote:
Originally Posted by paul1598419 View Post
The NDG7475 would be my choice as well. It has a can with a window and no lens attached to the can, so you can use a G-2 lens.
Although he'd be better of with three element lens if he's gonna use it for pointing. People pretend g2 lenses are great when in reality they have terrible divergence without a beam expander, but they're good for power.
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Old 05-09-2017, 09:39 PM #5
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Default Re: Which Green Diode ?

The NDG7475 has divergence similar to an M140 diode. It's not nearly as bad as the higher power diodes available now and is not too bad with a G-2 lens.
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Old 05-09-2017, 10:32 PM #6
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Default Re: Which Green Diode ?

If you are looking for a less expensive yet really powerful diode, I'd do the 01T. Some don't prefer it but with the G-ball still attached I think it makes for a wonderful laser. And the divergeance isn't bad either when just using the G-ball.
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Old 05-10-2017, 05:11 PM #7
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Default Re: Which Green Diode ?

Hi M
For a little more money the 7475 is what you want if your going to spend that much on a diode. If this is your first 520nm diode dive deep this way you have the best first then you can get the others. Besides it has a window and you can focus it with whatever lens you choose.
7475 is the flavor of the day ..

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Old 05-11-2017, 03:58 AM #8
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Default Re: Which Green Diode ?

The NDG7475 was my first choice. But I thought I would ask first as it is an expensive diode.

Just ordered one with 20mm mount and G2 Lens. If i am not happy with the beam I do have my X3 BE.

Thanks for all the comments.
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Old 06-11-2017, 02:32 PM #9
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Default Re: Which Green Diode ?

My NDG7475 arrived from DTR. Assembled it in a S4 Host. Using 2 18340 Lion Cells.

I modded the host slightly to give better heatsinking. These Green diodes produce a lot of heat for a small output. 1 Watt output and 9 watts of heat.

I bought the diode and driver mounted in one of DTR's 20mm modules. I purchased the S4 and the 20mm Adapter to suite DTR's module. What I did was use thermal adhesive and bonded the supplied 12mm adapter to the back of his 20mm module. Then I used the original 12mm mounting and the 20mm mounting. I drilled and tapped a 2mm Grub screw in the end of the outer ring to secure the 20mm module in place. It ends up about 25mm longer than standard. You can see in the picture.

I had read on here before about artifacts with the NDG7475 diode. I think it was related to the G2 lens ?. I took the photo with it aimed on a very black velvet area on my projector screen to stop the spot saturating.

It focuses to a nice bright spot. But it has a larger rectangle on one side of the spot. The Beam measures 1125 mw on my Hyperion.

I might try a 3 element lens and see if the artifact is gone.
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Old 06-11-2017, 02:47 PM #10
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Default Re: Which Green Diode ?

Very nice Mosc007.
Good job and +rep from me.
The 3 element will help with the beam quality but will reduce the power output.
I like that beam shot.
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Old 06-11-2017, 03:00 PM #11
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Default Re: Which Green Diode ?

Thanks. The beam shot makes the artifact look worse that it really is. It's actualy dim compared to the main spot. 3 element and G2 both have trade offs. I havn't run it outdoors yet. 1 Watt of green tends to light up the yard.

The main spot does focus quite well at 4 meters. Compared to Blue's it's pretty good. I do have a 3X BE I can put on it to tighten it up.

I do have another green which i bought in an assembled commercial module. I was told it's a NDG7475 but I have some doubts. Price seemed like the cheaper one. It has a 3 element lens and measures about 800mw on the LPM. It might be a NDG7475. 3 element would drop it that much.
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Default Re: Which Green Diode ?

It might be a NDG700!




The 2 element works wonders no splash and less power loss!
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Last edited by badboybilly; 06-11-2017 at 03:08 PM.
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Old 06-11-2017, 03:05 PM #13
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Default Re: Which Green Diode ?

Quote:
Originally Posted by badboybilly View Post
The 2 element works wonders no splash and less power loss!
Sounds nice. Were do I get a 2 element ?
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Old 06-11-2017, 04:06 PM #14
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Default Re: Which Green Diode ?

Quote:
Originally Posted by Mosc007 View Post
Sounds nice. Were do I get a 2 element ?
I'm sure DTR has them, AR coated for 520nm

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Old 06-11-2017, 04:08 PM #15
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Default Re: Which Green Diode ?

hi
The NDG7475 will drop in power with a 3E lens a lot, You might get 1+W's with a G2 . Nice build came out great just watch the duty cycle with that small sink the 520's also get hot.
Try the 3X BE on it it seems to be a nice size for your build not to bulky . Again great build nicely done Enjoy.. +REP

Rich
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Old 06-11-2017, 06:26 PM #16
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Default Re: Which Green Diode ?

What you are calling an artifact in the beam dot looks like something in your optical path. I'd check the diode window carefully. Also, look for anything out of place between the diode window and the lens. That rectangle should not be there and there is a reason for it. Just need to find what that reason is. It is also possible there is a reflection is the module that shouldn't be there.
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Last edited by paul1598419; 06-12-2017 at 02:14 AM.
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