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Old 09-21-2010, 06:38 PM #1
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Default A moment of silence....

Today, we gather to give thanks to the Lord our sheppard, for the gift that was our beloved friend, blue laser diode...

Sad but true, I was putting some final touches on the casing and the heat distribution system for my blue 1.25 watt laser build, with the batteries in the damned thing, and I slipped somehow and shorted just the right spot and blew the diode:

WAHHHHHHHHHHHH!!!

I knew I was begging for it but I thought I could slip it together without having to remove the batteries, which fit in the holder really tight, but alas I guess not. For what it's worth in terms of info for the group, this laser diode came into my hands about two months ago, and saw several changes in driver design and output power before this accident killed it. It began life in one of my small plastic cased pocket designs, operating at about 300 milliwatt. From there, I upgraded the driver board a couple of times, and ran the diode at increasingly higher powers. First, I made the 500mw mark, then 600, then 800, then up over a watt. Eventually I came to understand enough about the system to know what was holding it back from running yet higher, and I made the changes happen and ended up with a watt and a quarter, which is where I decided to let it stay. Running such high power quickly caused issues with heat dissipation, so I engineered an aluminum casing for it and gave it a largish heatsink for the diode housing. I ran it again and again at a full 1.25 watt or higher (I don't have an LPM so I am guessing based on the curves we've seen so far, with the input current at about 1.25A), gave it all kinds of burn tests and runtime tests, and was very impressed with it overall. Today, I was working on finishing up some of the details of the casing, and also was completing the heat transfer tab to channel heat from the current regulator to the casing, and I apparently bumped a sensitive spot and made just the right short. The diode emitted a brief and bright blue flash, and no more. I removed the diode, tested the circuit, tested the diode itself, and found that it was completely opened.

I'm already hot on the trail of a new diode, which hopefully won't take long to get here. Till then, I'll be focusing on adding the final touches to the casing and driver circuit (fan cooling, a modulation input jack and a safety killswitch), and then when the diode arrives, it will only take me a few mins to mount it and it'll be all done.

All I can say is next time, NO BATTERIES (when will I ever act like I know how risky this is???) and praise God these things don't cost hundreds each!


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First DIY laser experiment - "I... see... hmm... maybe something..."

First working DIY laser - "I see the light!"

First working DIY high power laser - "I see... wow... spots..."

First/Last DIY Class IV laser - "I do remember seeing a really bright flash... Will this heal?"


The Arsenal

0 - ~7mW 650nm "Junior Power" DIY Lab Laser
5mW 660nm DIY Dorcy Flashlight Laser
~50mW 532nm Modified Leadlight Laser Pointer
0 -200mW 660nm "Athena" DIY Pocket Laser
0 - >1W 445nm "Diana II" DIY Pocket Laser

Last edited by NightRunner417; 09-21-2010 at 06:41 PM.
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Old 09-21-2010, 06:52 PM #2
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Default Re: A moment of silence....

Apart from being an atheist*, I feel your loss and regret the passing off your faithful diode.

This is the kind of thing you are supposed to do to be accepted here, I just did it with 3 x 300mW LOC reds at $6 apiece, so far .


*As most Danes.
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Old 09-21-2010, 06:54 PM #3
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Default Re: A moment of silence....

You should post this story HERE

Peace,
dave
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Old 09-21-2010, 06:59 PM #4
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Default Re: A moment of silence....

^ Good call.

You won't be doing that one again will you?

Rushing never got a laser built without huge risk. I feel for you but would also like to welcome you to the Real Laserpointerforums!

Diode death is ever present...
Danger lurking behind every solder joint...
Can you build the ultimate homemade laser?!!! Dun Dun Duhhhh!


The simple answer is yes really. Just be careful!

Better luck with your next build.

M
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Another good guide can be found here from goninanbl00d - "First Build Guide"
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" ... Lasing on a sunny afternoon." The Kinks.

"Lasing on a Sunday Afternoon." Queen.

" Lase-y Sunday afternoon, I've got no mind to worry... " Small Faces.

"... Yes. It died during the night... So I cooked it! It was very nice." My Dad

Assembly services, parts machined and consultations for specialist builds available. PM me if you need something. Thanks.
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Old 09-21-2010, 07:12 PM #5
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Default Re: A moment of silence....

Is it considered bad form to duplicate an existing post into another thread here? If not, I'll go add it into that thread. :-)

And nope, I sure won't be doing that again. The bright spot here is my "next build" won't even be a build, it'll just be me soldering a new diode into the home vacated by this last one. AND, it'll be more or less all done at that point, so I won't have to worry about additional slipups due to more work on the design.

Gotta say it - these blues are hellfire in a tiny can. Last night when I was testing it out in the dark, I was stunned at how brightly it lit up my entire living room just by aiming it at the wall, and the dot is like "GAHHHHH must... not... look..." I had it to the point where it would set typing paper on fire in just a few seconds, really amazing.

Lol btw @ Morgan - "Dun Dun Duhhhh!" hahaha. :-)
__________________
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http://www.xkcd.com/729/

First DIY laser experiment - "I... see... hmm... maybe something..."

First working DIY laser - "I see the light!"

First working DIY high power laser - "I see... wow... spots..."

First/Last DIY Class IV laser - "I do remember seeing a really bright flash... Will this heal?"


The Arsenal

0 - ~7mW 650nm "Junior Power" DIY Lab Laser
5mW 660nm DIY Dorcy Flashlight Laser
~50mW 532nm Modified Leadlight Laser Pointer
0 -200mW 660nm "Athena" DIY Pocket Laser
0 - >1W 445nm "Diana II" DIY Pocket Laser
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Old 09-21-2010, 07:23 PM #6
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Default Re: A moment of silence....

Quote:
Originally Posted by NightRunner417 View Post
Is it considered bad form to duplicate an existing post into another thread here? If not, I'll go add it into that thread. :-)
Since a moderator asked you to do it, I wouldn't worry too much

People will read that thread more than this one

I just re-stickied it. It got lost for awhile

Peace,
dave
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Old 09-21-2010, 07:29 PM #7
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Default Re: A moment of silence....

Quote:
Originally Posted by daguin View Post
Since a moderator asked you to do it, I wouldn't worry too much
Haha, well... good point. Thanks Dave! :-)
__________________
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http://www.xkcd.com/729/

First DIY laser experiment - "I... see... hmm... maybe something..."

First working DIY laser - "I see the light!"

First working DIY high power laser - "I see... wow... spots..."

First/Last DIY Class IV laser - "I do remember seeing a really bright flash... Will this heal?"


The Arsenal

0 - ~7mW 650nm "Junior Power" DIY Lab Laser
5mW 660nm DIY Dorcy Flashlight Laser
~50mW 532nm Modified Leadlight Laser Pointer
0 -200mW 660nm "Athena" DIY Pocket Laser
0 - >1W 445nm "Diana II" DIY Pocket Laser
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Old 09-28-2010, 03:15 PM #8
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Default Re: A moment of silence....

*plays taps*
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