DTR's Laser Shop: Diodes-Drivers-Lenses-LEDs & More

[catalanjo]

+1
Bit of a worrying kink around 330ma IMHO
Cheers
PS
Hey....nice cat !

[absolom7691]

I still prefer 450nm over 462, so I'm enthused. I just purchased 4 of these to provide comfortable upgrades as compared with 2 PBS cubed 120mW single-mode 450s. My last two paired sets of over-driven 450 120mW single modes builds clocked in at 217mW and 259mW after the collimation and PBS cube were taken into consideration.

DTR's got these new diodes listed for US$37 each. So one $37 diode and mount as compared to a pair saves me $100+ per projector once you factor in the PBS cube, mounts and such. Not to mention less alignment time.

-David

450nm is not bad, I would just prefer them to be a little higher on the spectrum.

Ahh, I see Jordan just recently added them. Cool... with the 120mW greens, 180mW reds and these, some decent power SM projectors could be had. Yes, I know the 120mW greens are not SM but they sure act like it!

[DTR]

Check this out.

These are some awesome diodes. Slightly higher WL more power and from the looks of it same beam.

I got several of theses diodes in and more on the way and these diodes from what i tested so far are interesting for the WL. I think these diodes are Possible not WL binned because i got some Super and I mean Super high WL mixed in, in the lot of diodes i got. I ran them just under there MAX where they stopped increasing which is ~300mA-330mA. More testing is needed to see if thats still to high for safe running but all is good so far.


Check it out......

This is a typical diode WL for these diodes:


I test some more and at this same current^ "330mA" this is what the others did:
450nm
451nm
452nm
454nm

So at this current expect a range of 450nm to 454nm typical.. At right passed threshold ~30mW the diodes where all about 3nm less then what you would get at 330mA.. So not much of a swing however the interesting part is bellow.

As far as i can remember the PL450 3.8mm diodes where 445nm-450nm for the most part..


Now here the interesting part. 2 diodes i got (Out of 7 diodes tested) binned very High on WL. It is to be noted that in this images the current was at only 100mA:


The Other diode was at 464nm.

So these 2 diodes at 100mA where doing 461nm and 464nm to be clear.

Then I ran these 2 diodes at 300mA and the WL shot up to 466nm on one and 468nm on the other.

A larger Swing.

I got excited and Pushed the 468nm one Passed the MAX where the diode stops increasing which is ~380mA and the WL on this diode shot up to 474nm at 550mA and it was Holding ~400mW still since these dont really roll back much barely at all.. I Got to excited and went up to 650mA and Boom hit 476nm. (Shoul dhave left it) I felt luck was on my side and turned the knob a hair and Popped it. What a diode this was. I was blown away how high it got in WL.

The Second diode 464nm did a MAX of 471nm at 550mA and Popped too right when i tried to increase it more from 550mA on this diode.

These diodes DO NOT Rollback. They just die if you go too far... and the thing is there is No set point where they all die.

So if your one that wants to push it passed the MAX into the "rollback" to get that higher WL be-careful as at least for these 2 they dint die at the exact current.

If you get a High Bin WL diode IMO enjoy it and dont push it passed the MAX "Rollback" area to get even higher in WL. Its to risky.

The reason being is the Higher the WL is the Less efficient they are in power. As most of you should know that.

So being for this reason pushing it after the Max is very risky with these diodes.

Still getting a Noce 460nm+ Single mode diodes would be awesome for 300mW.

This is why i like these diodes so much.

[edison]

Nice. Does the nr450 refers to the max mw from the datasheet? I,m not really interested in how hard you can drive them i prefer to stay close to what the datasheet says. combining 6 would give a decent power with good specs

[DTR]

1W NUGM01T 520nm Laser Diode

Finally got some free time and did some testing of the NUGM01T diode. This is with a G-2 lens ball lens removed. As others have noted this is slightly less powerful than the NDG7475 diode but not by much. The diode seems to have the same beam profile and divergence of the NDG7475. Looking at the dye it does have one less bond wire than the NDG7475 which possibly is why it is slightly less powerful.



























So the efficiency drops off pretty steep after 2.4A and a peak of just over 1400mW.

[JohnYayas]

I v p
0.2 3.6 0.008
0.3 3.7 0.038
0.4 3.8 0.122
0.5 3.9 0.226
0.6 4.0 0.306
0.7 4.1 0.385
0.8 4.2 0.461
0.9 4.3 0.544
1.0 4.3 0.617
1.1 4.4 0.683
1.2 4.5 0.746
1.3 4.5 0.816
1.4 4.6 0.873
1.5 4.6 0.973
1.6 4.7 1.000
1.7 4.7 1.075
1.8 4.8 1.129
1.9 4.8 1.152
2.0 4.9 1.228
2.1 4.9 1.292
2.2 4.9 1.297
2.3 5.0 1.358
2.4 5.0 1.392
2.5 5.0 1.408
2.6 5.1 1.428

[DTR]

100mW NDG4216 515nm Laser Diode

Here is a great new diode. 100mW 515nm Nichia single mode diode. It is a tough little guy. It can take a lot more abuse than the Osram green diodes.

[catalanjo]

Hey Gary, .....translation needed again pls ... I do not have broadband here !
Cheers

[dkumpula]

Hey Jordan! Many thanks for the posts of the quick tests on the new green diodes.

In regards to the NDG4216, what do you mean its a 'tough little guy' exactly? Were you just referring to pushing it to twice its rated output or is there something more? The Osram PLP520-B1 can be pushed to 180mW (varying diode by diode) in my experience, but pushing it that far tends to decrease its life by quite a bit. It would be nice if this new arrival could handle the abuse a bit better. Its also nice that its a true single mode.

-David

[DTR]

Hey Jordan! Many thanks for the posts of the quick tests on the new green diodes.

In regards to the NDG4216, what do you mean its a 'tough little guy' exactly? Were you just referring to pushing it to twice its rated output or is there something more? The Osram PLP520-B1 can be pushed to 180mW (varying diode by diode) in my experience, but pushing it that far tends to decrease its life by quite a bit. It would be nice if this new arrival could handle the abuse a bit better. Its also nice that its a true single mode.

-David

Yea if you try to push 2x the recommended current into one of the Osram green diodes get damaged either open circuit, LED or zombie. These I put over 750mA and in so far without any damage to the diode after that they dim like the other new Nichia diodes do and then come back to life as you turn the current back down.