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Osram PLP520-B1 520nm Green Laser Diode

DrMario

DrMario

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Glass element lenses tend to be the best option at that wavelength. I think G-2 element lense gives me best result. And the green line in parallel with green laser beam could be the reflection from the on-die cavity between cavity front and the surface of the lense.

I think selective anti-reflective coatings may be the only option. I would think to try three glass lenses version to see if that minimize the frontal reflection from the edge of diode die.
 
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IsaacT

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3-Element lenses still result in an extra conical beam encircling the main beam at an angle of 45 degrees.
 
hakzaw1

hakzaw1

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Down with Umbrella said:
In March I'm going up to the arctic circle to work, I'll bring a greenie. Sounds interesting=] as far as I know AixiZ still sells a 515nm.
Click to expand...

Yes they do $85 plus ship- but its not a bare diode- just add 3-4 vdc to the red and black- good to go- all i tested made the same 26mW focusable in standard 12x30mm AixiZ module- the driver is embedded- it come in a black modlue holder that IMO should not be considered a heat sink- last time there tho I saw a newer and better fitting one with some fins- if ordering i suggest you specfically ask for the 'new' module holder- I did no murder testing on this module(BUT did TRY) so all i can say is i ran one for 15 min on a single Li-ion 3.7 vdc battery and it did not get hot at all. -
to find these g to aixiz.com- click on the green 532 section and its there-
2nd page IIRC- very nice round dot good divergence flat line LPM graph.
IMHO the perfect green for a very bright LUMIA- not so over bright that you will need 400mw of 650 or 405 - compares in visual brightness to ~700 mW of 445- i think there is a review on these --HAK
 
DrMario

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Ah, bummers. Probably it has to do with diode alignments (no faults of DTR - it can be caused by die bond solder).
 
DTR

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wannaburnstuff said:
Well I was thinking about it, and while 300mW would be nice, 200mW is also a good output. What lens do yall think would be the best?

My issue with diodes are the lens reflections that give the outputs like this
\..|../
_\||/_

If that makes sense? Like to each side of the main beam there is a arc like reflaction extending at a 45 degree angle between the beam and perpendicular to the host. I just want to get rid of that.
Click to expand...

Yep it is the reflection off the dye just like the box on the 445's. The three element lens will clean it up quite a bit but for a hit to the power.:beer:
 
DrMario

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At least I figured out where that dim green line came from (that came from retroreflection from within the diode cavity), so I stopped worrying about it. I went with G2 lenses knowing there's very little optical losses.
 
Atomicrox

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wannaburnstuff said:
Well I was thinking about it, and while 300mW would be nice, 200mW is also a good output. What lens do yall think would be the best?

My issue with diodes are the lens reflections that give the outputs like this
\..|../
_\||/_

If that makes sense? Like to each side of the main beam there is a arc like reflaction extending at a 45 degree angle between the beam and perpendicular to the host. I just want to get rid of that.
Click to expand...

Do you mean like this picture? (ignore the camera glare)
wings.jpg

This is my PL520 with a 3 element lens. I also wish I could "fix" it, because the wings tend to hit very far from the dot...
 
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IsaacT

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Thank you for explaining it!!! I don't own one at the moment but many diodes do this and it pisses me off.
 
DTR

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wannaburnstuff said:
Do you have any pictures of the triangular reflection?
Click to expand...

If I get time I will try to take one tonight.

Atomicrox said:
Do you mean like this picture? (ignore the camera glare)

This is my PL520 with a 3 element lens. I also wish I could "fix" it, because the wings tend to hit very far from the dot...
Click to expand...

Kind of hard to ignore the glare on that one.:p

Anyway that is a PL520 with a three element lens and he was looking for one of the PLP520-B1 with a G-2 lens. They are different diodes with different lenses.:beer:
 
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DrMario

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I apologize. Now I felt silly. :p

However, that got me wanting to find out why the multimode green laser diodes behavin' funny.
 
DTR

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It is all good. Looking to keep the info relevant for this diode.:beer:
 
PaulorNuthn

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Just curious if anyone has done an LPM test where driver is set at 650mA but run off a single 4.2V cell like a 16340 or 14500?

I would guess probably somewhere between 230mW-250mW but of course that's just wishful thinking.
 
DrMario

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You might want to go with 18650 Li-ion as 650mA diode setpoint would translate to 1.3 Amps on microboost or similar DC boost converter. You may want to go with buck driver if you want 16340 batteries. I never run two bare Li-ion batteries for safety reason.
 
PaulorNuthn

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DrMario said:
You might want to go with 18650 Li-ion as 650mA diode setpoint would translate to 1.3 Amps on microboost or similar DC boost converter. You may want to go with buck driver if you want 16340 batteries. I never run two bare Li-ion batteries for safety reason.
Click to expand...

Yeah a 18650 would be ideal, but I'm trying to keep the host size down to a Jayrob green kit, thanks for the advice and I think you're right, I'm going to have to bite the bullet and go for a 18650 build.
Cheers.
 
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