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FrozenGate by Avery

Osram PLP520-B1 520nm Green Laser Diode

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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3-Element lenses still result in an extra conical beam encircling the main beam at an angle of 45 degrees.
 
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.
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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
 
Ah, bummers. Probably it has to do with diode alignments (no faults of DTR - it can be caused by die bond solder).
 
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.
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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:
 
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.
 
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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Thank you for explaining it!!! I don't own one at the moment but many diodes do this and it pisses me off.
 
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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I apologize. Now I felt silly. :p

However, that got me wanting to find out why the multimode green laser diodes behavin' funny.
 
It is all good. Looking to keep the info relevant for this diode.:beer:
 
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.
 
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.
 
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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