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Flat Red Laser Diode Testing - 2nd Phase






Dave ---
Mine toasted at an unimpressive amount of current. I think I got ~ 218 mW....
It was mounted in my machined Aixiz housing with thermal epoxy after being locked into position with UV cure dental glue.
I'll try another if you want to spare one but since mine crashed to a low power laser suddenly, I have little hope for these but this is a test of only one diode.

HMike
 
Dave;

My 3-Wire Flat Reds are still working well @ 450ma.
I tested them up to 512ma.

The fabrication of a suitable mount has proved to be more of a challenge.

I used the round 4-wire mount system for the best heat transfer, but it was very time consuming to remove the 4-wire diode and replace with the 3-wire diode.

The 4-wire diode was epoxied to the heat sink.

LarryDFW
 
Hemlock_Mike said:
Dave ---
Mine toasted at an unimpressive amount of current. I think I got ~ 218 mW....
It was mounted in my machined Aixiz housing with thermal epoxy after being locked into position with UV cure dental glue.
I'll try another if you want to spare one but since mine crashed to a low power laser suddenly, I have little hope for these but this is a test of only one diode.

HMike
Click to expand...

PM me your address again. I'll send you a couple more to play with

Peace,
dave
 
I got the diodes...

Thanks Dave! :thanks:

I see that there is a plastic looking 'shield' over the front of the diode, similar to the LCC, and it looks like you just peel it off. Correct?

Also, can anyone give the pin connection?

I just would rather know the correct connection rather than trial and error if anyone knows.

Thanks!

Edit: Nevermind... I got it figured out, and have a nice AixiZ module modification for an easy mount as well! :)
http://laserpointerforums.com/f50/flat-red-mount-modified-aixiz-module-easy-49550.html

flat%20red.jpg
 
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Hi! I´m new in the forum, but not all new in killing laser diodes.
This thread remembers me of some strange sled I´ve extracted once. It was called "LPC-817" and I found it inside an LG GSA-H20L DVD burner (broken) I bought for diode extract on ebay. It had the LOC diode, which is driven by a 2-mode driver (360/460mA) since December 2009 and also a flat, 4-pin IR diode. Because I don´t have a lpm, I just turned up the current filming it. It died at around 380 mA or so, which I have on video.
 
I too have found a flat visible red LD, though it was probably less powerful than that. I also found a mini open can, with a decent-sized chip. That sucker was bright! The flat one burnt out, I didn't have a suitable heatsink. Now all it does is glow faintly and get way too hot to touch within half a second.

The mini open can looked just like the LOC, just shrunk down to ~3-4mm diameter.
 
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I wish people were still testing these. They seemed quite promising. I would love to try some myself but I dont think I have any....although I do have some misc sled laying around.
 
If you can find some low cost or junk DVD writers to test . . .,

there are some HI-POWER 4-pin Red diodes out there somewhere.

I have found some manufacturers charts,
showing long term operation @ 600 ma for 500 hours.

Power Input = 3 Volts x 600ma = 1.8 Watts

At a reasonable efficiency of 25%, that would = 450mw of output power.

Those are the ones we are looking for.

LarryDFW
 
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This is just a suggestion for someone much more knowledgeable about these diodes than myself.

Would it be possible to create a thread in which sleds that have been harvested and tested are listed as well as sleds which may contain the desired diodes? I would love to help but at the same time dont know what to look for and would hate to purchase a sled just to discover something that is already known.
 
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I don't know if anybody is playing around with these diodes anymore. But I have managed to get one working. It's my first laser "hack" and it's totally ghetto. But ... I am pleased none the less . About two weeks ago I stumbled on a video that some kid and his "burning red laser" from old computer parts. I was intrigued and decided I had to try it out. So... after tearing up a bunch of old DVD players and Burners I figured out how to build a "driver" and by the time I had it built I'd burned out all my diodes! All but this flat thing....with an odd heat sink. Now... with the only module that I had on me was a brass housing off an old dollar store laserpointer. I managed to work the flat diode (lpc-817?) from it's heat sink (easier than the round ones!!!) .. with some creative work ( a square inch of copper as a heat sink and a shim....) I managed to wedge the diode into the pipe and then I drilled out a computer heat sink and put a set screw in it to hold the pipe on the heat sink. I'm driving the diode with a 9v batt through a 7805 and 317 driver circuit set at about 250mA... After collimating the beam at 5m I can see the beam well and clear at about a 500M distance... and properly focused up close it can light a match and burn small holes in stuff... I don't have a power meter or any fancy stuff like that... this was just a hack.. but thought I would share.
 
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Every time I try and hook up one these flat reds I led it. I know they have got to have some potential. The guys on these forums don't like them cause they cant pop them into their normal axiz housings ...put up some pics if you have any. I have around 10 of these and would love to get 1 working
 
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