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Old 03-26-2013, 02:33 AM #1
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Default What diodes are these?

Destroying an old DVD burner to harvest out the diodes for more of practice than actually needing them. My question is what are they? I assume one is IR and one a form of red but who knows. brand is HL Data Storage Model number GSA-H30L. Couldn't find anything about it other than it possibly having the above diodes. It for sure has 2 of them. Will post pictures once (or if rather) I get them out.

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Edit: Here are the pictures.


Both are the same height. Distance from camera makes it look otherwise.


Not sure if you can tell from the picture but the one on the left is shiny and the other one is the dull look I'm used to with the few diodes I have seen.


Shiny closeup. Don't mind the tool marks on the can


Not shiny.

Id prefer to refer to them as shiny and not shiny since other than the texture of the can they are, to me, identical.


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Old 03-26-2013, 04:17 AM #2
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Default Re: What diodes are these?

Correct. One is 780nm and one is 660nm. Power each up to 400mA. If it dims or dies, it wasn't worth keeping (in my humble opinion).
A 250mW 660 diode is like $4 these days, so it's rather foolish to spend a lot of time on a 50mW diode or whatever it may be.
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Old 03-26-2013, 02:19 PM #3
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Default Re: What diodes are these?

Do you know which is which? I would prefer to not power up anyyhibg IR as I dont have any protectiob for that yet.
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Old 03-26-2013, 02:28 PM #4
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Default Re: What diodes are these?

The only way to know is to hook it up to a low power driver and look at the dot without the lens. Ir is almost invisible and the red diode should give a noticeable red color.
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Old 03-26-2013, 02:31 PM #5
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Default Re: What diodes are these?

Any guess on the positive and negative pins?
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Old 03-26-2013, 02:46 PM #6
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Default Re: What diodes are these?

I think both diodes are case negative.

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Old 03-26-2013, 03:10 PM #7
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Default Re: What diodes are these?

Will fire them up tonight and see what happens!
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Old 03-26-2013, 09:19 PM #8
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Default Re: What diodes are these?



Here it is running at 410mA at 3.5V. Not sure what the voltage of this is so I just guessed. At least it ran. Didn't test the IR one past the point of me finding out it was the IR one because I honestly could care less haha. Ran like this for 3 minutes while I stacked things to get it in line with the Ophir and then get it focused. Worth saving? What voltage should I be running it at?

Also don't you worry about that Arduino in the Nospin. I will make that thread once I get some parts in
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Old 03-26-2013, 09:23 PM #9
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Default Re: What diodes are these?

Looks like a regular LCC red diode to me. What lens did you use ?
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Old 03-26-2013, 09:26 PM #10
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Default Re: What diodes are these?

G2. The only spare lens I have rolling around at the moment.
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Old 03-27-2013, 12:45 AM #11
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Default Re: What diodes are these?

On a slightly related note, what is that labby heatsink you're using there?

(nevermind, I found it)
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Old 03-27-2013, 02:30 AM #12
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Default Re: What diodes are these?

Quote:
Originally Posted by Blord View Post
Looks like a regular LCC red diode to me. What lens did you use ?
Looks like a damn efficient one as well!
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Old 03-27-2013, 02:36 AM #13
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Default Re: What diodes are these?

AND its gone... Tried to use a 450mA driver I had laying around. had it all in an empty host ready to go. Was working fine while I was turning it on and off slowly adjusting the focus on a lens I found in a drawer (not the G2) with out the little knurled end. Had a nice dot to infinity going. Got my meter out and had the laser sitting in my tripod, turned it on. LED Hmm 450mA was probably too much, or it was all the on off. Oh well I had nothing invested in this and it was a nice learning experience.
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Old 03-27-2013, 02:40 AM #14
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Default Re: What diodes are these?

Didn't even see this post. Yeah its one by Mrcrouse. Very well built and it just looks amazing. Can mount it to a work bench if needed if you do a\lot of testing.

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Originally Posted by Bionic-Badger View Post
On a slightly related note, what is that labby heatsink you're using there?

(nevermind, I found it)
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638nm Mrcrouse Custom 650mW
658nm wannaburnstuff baby shower gift? 127mW
808nm Coherent CCP 10W

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"The right man in the wrong place can make all the difference in the world."
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Old 03-27-2013, 10:09 PM #15
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Default Re: What diodes are these?

Quote:
Originally Posted by Speedy78 View Post
AND its gone... Tried to use a 450mA driver I had laying around. had it all in an empty host ready to go. Was working fine while I was turning it on and off slowly adjusting the focus on a lens I found in a drawer (not the G2) with out the little knurled end. Had a nice dot to infinity going. Got my meter out and had the laser sitting in my tripod, turned it on. LED Hmm 450mA was probably too much, or it was all the on off. Oh well I had nothing invested in this and it was a nice learning experience
A little tip... Look inside of the window of the laser diode and count the number of bond wires. If there is only one, that is a very good indicator that the laser diode was likely designed to be run at less than 250-300mA CW. There are quite a few dead laser diodes in my gold scrap bin that were sent to me by others for analysis. The greatest majority were killed by overdriving to the point of COD (Catastrophic Optical Damage). Relatively few were driven to the point of bond wire failure, which typically occurs at over 500mA per bond wire. When a laser diode "LEDs", that is a common sign of COD. It can occur suddenly from extreme overdriving, or more slowly from driving any laser diode at more than about 20% beyond the manufacturers maximum CW rating. When laser diodes degrade from being overdriven, that is typically when they are showing the signs of Optical Damage. The common hobbiest trend of pushing their laser diodes to just under their failure limits is rampant. So many then wonder why their lasers die ;-)

Bob

Last edited by Bob_Boyce; 03-27-2013 at 10:24 PM. Reason: typos
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