Author Topic: howto fix laser diode  (Read 1526 times)

moritz

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howto fix laser diode
« on: November 26, 2017, 03:47:35 AM »
I am building a 2w laser diode and the hole inside the 12mm housing is bit to large can i glue the diode with sec.glue or with hot glue ?

Landbo

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Re: howto fix laser diode
« Reply #1 on: November 26, 2017, 04:02:13 AM »
I am building a 2w laser diode and the hole inside the 12mm housing is bit to large can i glue the diode with sec.glue or with hot glue ?

No unfortunately, it does not work. The diode will not get any cooling and immediately kill itself.

Regards Leif.
Only a new "Wood Smoker"  /;-)

Lob0426

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Re: howto fix laser diode
« Reply #2 on: November 26, 2017, 11:55:23 AM »
The 12mm housing acts as part of the heat sink. The most common sizes are 3.8mm, 5.6mm and 9mm. If it cannot transfer the heat it will burn up.

https://sites.google.com/site/dtrlpf/home/diode-modules

The stock laser 500mw laser module I had had a brass adapter from 3.8 to 5.6mm. I have never seen those for sale. You can get the laser host modules in all these sizes on Ebay and Amazon. They are not expensive. Get one that is the proper size and try to get a copper, rather than brass if you can. Not real important for only 2W.
Richard
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moritz

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Re: howto fix laser diode
« Reply #3 on: November 27, 2017, 12:47:26 PM »
Yes i have ordered a new one....

Lob0426

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Re: howto fix laser diode
« Reply #4 on: November 27, 2017, 05:11:09 PM »
That adapter is a really small ring and counter sunk to accept the smaller diode. I could have made one, but for the price of the modules it's just not worth the time! For me I just had to remove the adapter to go to a bigger diode. Unfortunately I damaged the adapter getting it out.

Good luck!
Richard
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laser_cutter

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Re: howto fix laser diode
« Reply #5 on: November 27, 2017, 05:59:40 PM »
I am building a 2w laser diode and the hole inside the 12mm housing is bit to large can i glue the diode with sec.glue or with hot glue ?

where did yo get just a diode?

Lob0426

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Re: howto fix laser diode
« Reply #6 on: November 27, 2017, 08:41:13 PM »
I got some from DTRLaser and some from Ebay!

https://sites.google.com/site/dtrlpf/
http://www.ebay.com/bhp/laser-diode

I have like 3 2W M140 diodes here! from Ebay.
upgraded the stock 500mw benbox laser module to 2W. Using a DTR Laser driver.

That is here:
http://benboxlaser.us/index.php/topic,782.0.html

As you will see it had a non-standard host module. Most of the earlier ones had this screw in 20mm host!
« Last Edit: November 27, 2017, 08:47:24 PM by Lob0426 »
Richard
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mrehmus

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Re: howto fix laser diode
« Reply #7 on: November 28, 2017, 03:39:49 PM »
You can also use heat conducting epoxy. Something like Delta Bond which I've used to fasten semiconductors to heat sinks.
mrehmus
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Lob0426

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Re: howto fix laser diode
« Reply #8 on: November 28, 2017, 07:32:09 PM »
Even with the heat conducting epoxy you need metal to metal contact to protect the diode. Metal to metal is always the best conductor! heat sink compounds and epoxy are good for filling in any gaps or attaching.
Richard
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mrehmus

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Re: howto fix laser diode
« Reply #9 on: November 28, 2017, 09:05:57 PM »
Heat conducting epoxy has metal in it.
mrehmus
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Lob0426

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Re: howto fix laser diode
« Reply #10 on: November 28, 2017, 11:37:25 PM »
Yeah I know. It still is not meant to fill large gaps. It is meant to attach the heat sink to the component. Heat sink compound is only meant to fill air gaps for the best contact. Heat sink compound is more efficient but has no real hold.

It was most likely a 3.8mm and the 2W is a 5.6mm. The diode "base" is pressed into a countersunk socket. It connects on most of the face and around the circumference.

Could the epoxy work? Maybe. But it would not be as efficient as real metal to metal contact. So diode life might be reduced. The best is to press it in using heat sink compound to guarantee the best conduction.
Richard
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moritz

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Re: howto fix laser diode
« Reply #11 on: December 03, 2017, 08:19:19 AM »
just got my Diode from:  https://www.ebay.de/usr/lz4gv-com?_trksid=p2057872.m2749.l2754

it is now inside a 12mm Housing and a black Alu housing....i did the installation this way: 

https://www.vicious1.com/wp-content/uploads/2016/01/MPCNC-laser-add-on-walk-through-Rev2.0.pdf

My first tryout with 12V to the Laserboard was working now i will install it to the L7 Eleksmaker and substitute my 2.500 MW with no TTL ...
Actually i am waiting for a new 3000MW Laser with TTL/ PWM so this will go to my 3d Printer later...