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FrozenGate by Avery

NDG700 700mW 520nm Laser Diode

DTR

DTR

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Joined
Jun 24, 2010
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Nichia NDG700 700mW 520nm Laser Diode


They look just like the 1W version.
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With the same off center pins.
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Here it is. The little brother to the 1W 520nm Diode. Pretty much the same as the 1W version other than slightly less powerful and a lower pricetag. I won't bother with a picture of the output as it looks identical to the 1W version. I was not given the datasheet but maybe someone resourceful can dig it up like we did for the 1W version. The supplier is trying to avoid a big to do like there was when the 1W ones were leaked. Apparently they have been available all along but it was the 1W ones that originally escaped into the wild. It is a 1.4A rated diode and averages about 850mW there and a little higher if pushed. Also I am sure when TEC cooled it would produce a significant bump in output. Anyway here is the testing.


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Did a quick run pushing to 1.8A to show the stability of the diode.



There you are. Grab them while I have them. Not sure of the future availability on these.:)

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Re: NDG 700mW 520nm Laser Diode

nice job DTR for keeping us laser heads in good diodes
 
Re: NDG 700mW 520nm Laser Diode

Awesome. I was wondering when you would do a review of this "new" diode.:beer:
It looks like the efficiency starts to drop off after 1.8A.

If it can last at 1.8A in a handheld that it will be almost as good as the NDG7475 1W 520nm but at a significantly lower price.
 
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Re: NDG 700mW 520nm Laser Diode

Yep the 1W version can be pushed to about 1.3W-1.4W no problem where these can do 900mW-1W no problem from the looks of them.:beer:
 
Re: NDG 700mW 520nm Laser Diode

I'm really starting to like 9mm diodes. They seem to be able to handle so much current.
 
what is the divergence like with this diode in comparison to the 1W 520 DTR? can you tell any visible difference etc? or would you say both are almost identical?
 
thankZ, you wouldnt beleive i read the thread twice before posting either, well skim read ..... haha
 
Of course pictures are rarely accurate at representing laser light but it looks yellower than it "should". Perhaps this is closer to 530nm than 520nm. Or perhaps it's just the camera.
 
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Garoq said:
I like at 1.8A, looks stable enough. Lower current = lower heat. :-) Thanks Jordan!
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Yea I was very happy these seem to be pretty stable right @ 1W. Makes them a nice value.:beer:
 
Wow I haven't been on the forums in ages and I come back to green diodes. I'm a little excited
 
Any wavelength testing done on one of these?

I'd love to see how the wavelength changes over the span of threshold to max current, and 0-40C. Not to assume how low/high these go. Just to plot out a percentage of change over a given temperature change. I expect it to be similar to other diodes of this type.

However, it'd be neat to see if running these stabilized for 0C @ 800-1000mA for something like 350-500mW of <510nm. Just a thought.
 
I just put one of these in a Cypreus-IIb yesterday. This diode defiantly puts out the heat! Even in all this copper it get warm in ~40 seconds.

It also looks like I got something on the diode window. These are pics of the raw output.

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Does it look like this will hurt the diode? Should i try cleaning the window?
 

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Does it look like this will hurt the diode? Should i try cleaning the window?
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I would try, with a q tip, it should work. good thing is 9mm diode windows are bigger, and therefore easier to clean. I've done it many times. 3.8mm diodes like the 520 osram are a PITA
 
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