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Old 12-18-2011, 12:25 AM #1
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Default Stangest beam pattern ever?

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

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.



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?



Here's another shot facing toward the laser




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.




Anyone have any thoughts at all?



Last edited by mark-in-dallas; 12-18-2011 at 03:21 AM.
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Old 12-18-2011, 12:36 AM #2
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Default Re: Stangest beam pattern ever?

I'll give you $1000.00 for that diode

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

This is 1 in 1,000,000 turn the current down and save it !
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Old 12-18-2011, 12:44 AM #3
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Default Re: Stangest beam pattern ever?

Quote:
Originally Posted by Flaminpyro View Post
This is 1 in 1,000,000
Potentially accurate!

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Old 12-18-2011, 06:44 AM #4
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Default Re: Stangest beam pattern ever?

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
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Old 12-18-2011, 07:45 AM #5
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Default Re: Stangest beam pattern ever?

Quote:
Originally Posted by Wolfman29 View Post
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
That's my guess, essentially two LDs in one can.
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Old 12-18-2011, 08:48 AM #6
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Default Re: Stangest beam pattern ever?

Quote:
Originally Posted by Wolfman29 View Post
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
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.
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Old 12-18-2011, 08:53 AM #7
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Default Re: Stangest beam pattern ever?

Wow, you are one lucky guy! Now you can claim you have a 2 diode 445 handheld
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Old 12-18-2011, 10:44 AM #8
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Default Re: Stangest beam pattern ever?

Nice two for one! Reminds me of Multi-line argon.
Don't be afraid share more pics or video.
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Old 12-18-2011, 02:25 PM #9
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Default Re: Stangest beam pattern ever?

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.
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Old 12-18-2011, 03:54 PM #10
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Default Re: Stangest beam pattern ever?

thats awesome, two beams from one diode
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Old 12-18-2011, 05:37 PM #11
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Default Re: Stangest beam pattern ever?

Hmm. Very interesting nonetheless.
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Old 12-18-2011, 06:28 PM #12
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Default Re: Stangest beam pattern ever?

You have a true one of a kind there Mark...

Not sure whether that's lucky or not, but it certainly is unique.
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Old 12-19-2011, 12:32 AM #13
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Default Re: Stangest beam pattern ever?

Thats just crazy! I did not know this was possible

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Old 12-19-2011, 02:13 PM #14
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Default Re: Stangest beam pattern ever?

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.
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Old 12-19-2011, 09:32 PM #15
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Default Re: Stangest beam pattern ever?

Thats cool )
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Old 12-21-2011, 06:43 PM #16
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Default Re: Stangest beam pattern ever?

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
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