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Old 04-10-2011, 08:16 PM #33
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Default Re: A really tough 445nm! Burned and fixed!

Very cool that you got it working again. Also, AMAZING photos. Btw, when you soldered it, it shorted together the three wires on the broken side. Does that adversely affect the diode?


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Old 04-10-2011, 11:10 PM #34
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Default Re: A really tough 445nm! Burned and fixed!

the shorted wires all run to the same spot anyways.



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Old 04-11-2011, 08:20 AM #35
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Default Re: A really tough 445nm! Burned and fixed!

That is awesome!!

Btw, post a schematic of your driver (if it hasn't been done before). Any new, easy driver for me to build would be handy.
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Old 04-12-2011, 01:05 PM #36
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Default Re: A really tough 445nm! Burned and fixed!

Quote:
Originally Posted by chipdouglas View Post
the shorted wires all run to the same spot anyways.
Yes, that is true

Quote:
Originally Posted by JaiNobeZ View Post
That is awesome!!

Btw, post a schematic of your driver (if it hasn't been done before). Any new, easy driver for me to build would be handy.
First I have to draw the schematic :P then I'll post it

Currently I'm designing the PCB for the laser driver with led bar battery status, laser diode temperature led bar dispay, fan on/off control, and laser shutdown in case of low battery or high diode temperature

Last edited by sammo; 04-12-2011 at 01:12 PM.
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Old 04-19-2011, 09:45 PM #37
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Default Re: A really tough 445nm! Burned and fixed!

Well - I have a $200 HL63133DG that does not work - at all. I think I'm going to duplicate your process, since I've got nothing to loose here.

My DMM shows no continuity/conductivity between the pins, so I think there must be an internal connection problem.
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Old 04-19-2011, 10:50 PM #38
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Default Re: A really tough 445nm! Burned and fixed!

My fingers are crossed for you, rhd.
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Old 04-20-2011, 12:41 AM #39
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Default Re: A really tough 445nm! Burned and fixed!

Not a chance - gave it a shot, but the leads were a 100th of the width of my soldering tip.
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Old 04-20-2011, 08:07 AM #40
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Default Re: A really tough 445nm! Burned and fixed!

Can you see where the leads are melted/not connected?
Believe it or not, it was the same with my soldering, the leads are 1/100 of the solder tip diameter. The trick is to not touch the thin leads with your soldering tip, you just dip them for a moment into melted soldering material on the side of the tip. You have to be fast enough and very precise in order not to apply too much solder. I also mean being fast after you actually melt the solder because I think the flux does it's best work only a few seconds after melting (you probably can't apply flux to such small leads).
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Old 04-20-2011, 03:37 PM #41
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Default Re: A really tough 445nm! Burned and fixed!

These leads are so thin that they melted even further when even near my soldering iron. I would imagine it's the difference between leads on diodes meant to handle 2A, and those mean to hand 0.25
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Old 04-24-2011, 11:41 PM #42
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Default Re: A really tough 445nm! Burned and fixed!

Impressive repair
I tried this myself earlier today, the whole thing just turned into a blob of solder
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Old 05-01-2011, 08:10 AM #43
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Default Re: A really tough 445nm! Burned and fixed!

My theory re. the reversible nonthermal output loss at higher currents.

The diode is basically a resonator at optical frequencies.
Think of it like an optical Gunn diode, where it has peak and valley currents.
So as the current rises, the optical output will increase up to a point.
As it exceeds this the optical output increase with current starts to decrease because the active region becomes saturated with electrons and holes recombining.

At even higher power levels the electrons and holes recombine in a way which does not emit light and therefore the optical output collapses.
As long as the die doesen't heat up too much this is reversible, but normally COD occurs well before this in smaller diodes.
I speculate that the larger thermal mass of the 445's crystal prevents this.

Comments?

Also re. soldering problem, has anyone considered making some magnetic solder and using that?
Ought to help as the solder heats up only rather than the entire casing.

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Old 12-03-2012, 11:27 PM #44
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Default Re: A really tough 445nm! Burned and fixed!

My personal theory is that the 3 wires are so that if you feed it too much current then 1 of them will melt rather than the whole unit.
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Old 12-03-2012, 11:33 PM #45
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Default Re: A really tough 445nm! Burned and fixed!

Quote:
Originally Posted by robmobz View Post
My personal theory is that the 3 wires are so that if you feed it too much current then 1 of them will melt rather than the whole unit.
This thread is long dead, please don't bring it back from the dead.
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Old 12-04-2012, 11:09 AM #46
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Default Re: A really tough 445nm! Burned and fixed!

My bed I guess .. I linked it in another thread ..
Still it's amazing thread ..
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