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Stangest beam pattern ever?

mark-in-dallas

mark-in-dallas

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Id say this is the #1 strangest diode beam I've seen. :D

Does anyone have any ideas on what the deal is with this diode?

The diode appears clean and undamaged and there is no dust or debris on the diode or lense.

The driver was set to 1.2A and the laser LPM's at 1,050mW. The main beam is obviously the stronger one, but if I had to guess I would say the secondary beam would probably be around 300mW or so.

This picture is of the beam pattern hitting a wall about 3 feet away, without the lense.

IMAG0248.jpg


This one is with the lense on and focused for a distance of about 25 feet. Notice the second beam triangulating away from the first?

IMAG0250.jpg


Here's another shot facing toward the laser

IMAG0251.jpg



Finally, in this one you can clearly see a second dot, which is diverged approximately 3 inches off from the main dot at about 25 feet.

IMAG0246.jpg



Anyone have any thoughts at all? :huh:
 
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I'll give you $1000.00 for that diode :crackup:

Seriously that is the #1 strangest beam pattern I have
ever seen, even on a multi mode diode :thinking:

This is 1 in 1,000,000 turn the current down and save it !
 
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Is it possible that there is just a crack or an imperfection in the emitting face right where that black spot is? It seems like that lensless beam is perfectly normal, save that "line" where there should be emitted light... almost like there is something blocking it =p
 
Wolfman29 said:
Is it possible that there is just a crack or an imperfection in the emitting face right where that black spot is? It seems like that lensless beam is perfectly normal, save that "line" where there should be emitted light... almost like there is something blocking it =p
Click to expand...

That's my guess, essentially two LDs in one can.
 
Wolfman29 said:
Is it possible that there is just a crack or an imperfection in the emitting face right where that black spot is? It seems like that lensless beam is perfectly normal, save that "line" where there should be emitted light... almost like there is something blocking it =p
Click to expand...

Not that is visible to the naked eye or under a magnifying glass. And, the black part on the diode emitter is not angled like the break in the beam pattern, nor does it explain the extra light that makes it look like a #1.

The break in the beam does like like the light is being blocked by something, but I can see nothing that would actaully block it.

This diode has me baffled.
 
Wow, you are one lucky guy! Now you can claim you have a 2 diode 445 handheld :D
 
Nice two for one! Reminds me of Multi-line argon.
Don't be afraid share more pics or video. :D
 
Wow. That's a cool find.
The first thing I thought was that it looked like a multi-line.
It may seem undesirable for a pointer, but owning an anomaly like that is pretty cool. :)
 
You have a true one of a kind there Mark...

Not sure whether that's lucky or not, but it certainly is unique.
 
What strikes me most is that the beams have different direction. If something was just blocking part of the beam, it would not behave like this. I guess the substrate is cracked. It might be tiny invisible crack, and it might not even go through full depth. But the whole surface is not facing same direction anymore. As the diode has 3 feeding wires, both halves still get power, yeah, as you said .. basically 2 diodes. It looks cool.
 
I think the extra light is coming from whatever is causing that blanked section of the beam. Could be a refraction or reflection at play here, depending on what is in the way of the diode.

I don't think the die snapped in half, otherwise it wouldn't lase.

Interesting find :D
 
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