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Old 04-18-2014, 05:33 AM #1
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Default 3.5W NDB7A75 445nm Laser Diode

3.5W NDB7A75 445nm Laser Diode


Finally got around to doing some testing on this bad boy. I think this is comfortable running @ 3.5A for a very stable output and 4A max if you want to push it a bit. Here is a quick video.





The divergence of the diode does take a hit compared to the M140's and NDB7875's(9mm 445's) we have been using.








Now on to the power test with a 405-G-2 lens













































There we have it a very powerful 445nm diode but a with a pretty wide divergence.




Last edited by DTR; 04-19-2014 at 04:23 AM.
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Old 04-18-2014, 05:54 AM #2
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Default Re: 3.5W NDB7A75 445nm Laser Diode



also your video is private*

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Old 04-18-2014, 06:45 AM #3
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Default Re: 3.5W NDB7A75 445nm Laser Diode

I love how when you scroll through the power test pics fast enough the laser glare around everything steadily increases. thanks for doing these for us all
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Old 04-18-2014, 07:45 AM #4
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Default Re: 3.5W NDB7A75 445nm Laser Diode

Great review, I love the fact that at 900mA there is 1079mW out better than 1 to 1
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Old 04-18-2014, 10:48 AM #5
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Default Re: 3.5W NDB7A75 445nm Laser Diode

Tnx, DTR!
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Old 04-18-2014, 11:51 AM #6
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Default Re: 3.5W NDB7A75 445nm Laser Diode

Quote:
Originally Posted by DTR View Post

Now on to the power test.



[/SIZE][/CENTER]

This seems most amazing to me- It seems like a very low lasing threshold for its power rating!
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Old 04-18-2014, 01:55 PM #7
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Default Re: 3.5W NDB7A75 445nm Laser Diode

On the test I did my voltage was higher and I got more power at 4a got 5.1v and 6w could it have been a rare diode or just my power supply?
new 445nm diode hits 6.5W at max power test - YouTube
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Old 04-18-2014, 02:51 PM #8
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Talking Re: 3.5W NDB7A75 445nm Laser Diode

WOW!!!! That baby really packs a punch.
Lots of power and it looks very efficient, but the divergence looks to be twice that of a M140
and NDB7875 diode. That means that to get a quality beam form this diode it will have to pass
thru alot of corrective glass which means power loss.
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Old 04-18-2014, 02:55 PM #9
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Default Re: 3.5W NDB7A75 445nm Laser Diode

Greetings,

I would say the power supply.
Now, we know the max current but what I would also like to know is what is the max voltage these will take before they pop.
Please correct me if I am wrong, but aren't these 3-5vdc diodes ?


cheers,
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Quote:
Originally Posted by ricktrent4 View Post
On the test I did my voltage was higher and I got more power at 4a got 5.1v and 6w could it have been a rare diode or just my power supply?
new 445nm diode hits 6.5W at max power test - YouTube
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Old 04-18-2014, 03:29 PM #10
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Default Re: 3.5W NDB7A75 445nm Laser Diode

Jordan, were you using a G-2 or 3 element lens on these tests? I have been getting 4.7-4.9W at 2.8A current using a G-2.
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Old 04-18-2014, 03:35 PM #11
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Default Re: 3.5W NDB7A75 445nm Laser Diode

OK....Much thanx DTR 4 the excellent review....You brave the trail again !!!

SOooo....now....we have lotsa power....and efficiency ....in a single diode source....and the " Fly in the Ointment"......DIVERGENCE !!!!

SOoooo....Let's look at this....again....

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Old 04-18-2014, 03:48 PM #12
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Default Re: 3.5W NDB7A75 445nm Laser Diode

Man, these are amazing times I can't wait to own both of the new ones you stock (1W 520nm, and 3.5W 445)
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Old 04-18-2014, 04:20 PM #13
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Default

Thanks DTR ! Great info ! So mine should be right around the 4.5w range. My lpm just left N.Y., should find out next week for sure. I know it set my backyard on fire last night.
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Old 04-18-2014, 07:37 PM #14
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Default Re: 3.5W NDB7A75 445nm Laser Diode

Good testing DTR, seems either you tested a less-efficient diode than Rick or something is wrong with his power supply and or LPM(possibly something might be wrong with your LPM?). I find it hard to believe that his power supply or LPM is that off but something must be up off, unless he just had a more efficient diode or you have a less-efficient diode.

Moe, I doubt that a DC power supply such as the Mastech could be that far off. I'd bet it has to do with either that particular diode or someone's meter.

DTR could you do some testing with a 3 element lens and compare the divergence/power output to a standard 7875?

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Old 04-18-2014, 07:42 PM #15
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Default Re: 3.5W NDB7A75 445nm Laser Diode

That is around what I was getting. You can see in my video at 3a. I was getting 4.84w at 4.9 volts

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Originally Posted by Garoq View Post
Jordan, were you using a G-2 or 3 element lens on these tests? I have been getting 4.7-4.9W at 2.8A current using a G-2.
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Old 04-18-2014, 07:50 PM #16
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Default Re: 3.5W NDB7A75 445nm Laser Diode

I see you had to upgrade the power supply to a 10A one

Thanks for the tests!
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