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Old 03-23-2014, 07:31 AM #1
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Default Best thermal pathway for heatsinks

Hi LPF, I was thinking of designing a heatsink and came upon a question.

I'm using 9mm diodes in a threaded module. Is it better to:

Use only the copper module and have the back of the diode contact the heatsink. This will leave an air gap where the module is threaded:



Use the aluminum back, but the back of the diode will not be heatsunk.



Would love to hear your guys' thoughts.


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Old 03-23-2014, 08:29 AM #2
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Default Re: Best thermal pathway for heatsinks

I've always believe that the drive casing should be present, because without it, there's an air gap where the threads are right next to back of the diode. I had hoped that some of the modules would be made solid, with no threading, but so far nobody has made them.

Still, if you can manufacture the first option with sufficient thermal contact, it might be a good way to go too.

A better solution might be to get some of the modules from Rick Trent that have the drive case made of copper too.
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Old 03-23-2014, 09:09 AM #3
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Default Re: Best thermal pathway for heatsinks

Great, thanks for your input.

I have an uneasy feeling about the back of the diode not touching anything in option two. Seems like a waste not to heatsink the flat part.
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Old 03-23-2014, 11:04 AM #4
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Default Re: Best thermal pathway for heatsinks

DTR has modules for the 9mm that has the back part that contacts the back of the diode
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Old 03-23-2014, 01:12 PM #5
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Default Re: Best thermal pathway for heatsinks

Whoops, didn't realize DTR was selling them, or else I would have happily gotten those. Wish they were copper though, haha. Thanks for the info!

Couldn't rep you, sorry!

Edit: Are the modules on his website? Can't seem to find them...
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Old 03-23-2014, 02:06 PM #6
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Default Re: Best thermal pathway for heatsinks

this helps me too. I think I will have to get one of those from DTR. too bad they are not copper, but rick trent's would not fit in the heatsink I have without being shortened. An Aluminum is much better than nothing, and then no air gap, as B-B pointed out
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Old 03-23-2014, 02:40 PM #7
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Default Re: Best thermal pathway for heatsinks

Quote:
Originally Posted by ryansoh3 View Post
Whoops, didn't realize DTR was selling them, or else I would have happily gotten those. Wish they were copper though, haha. Thanks for the info!

Couldn't rep you, sorry!

Edit: Are the modules on his website? Can't seem to find them...
I don't really know. I just ordered a 9mm diode and got this. Maybe you can simply purchase the 9mm diode with module and send him a message that this is what you want.
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Old 03-23-2014, 02:42 PM #8
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Default Re: Best thermal pathway for heatsinks

Thanks.

Meanwhile, I'll need to make do with these modules, haha.
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Old 03-23-2014, 10:46 PM #9
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Default Re: Best thermal pathway for heatsinks

Maybe you can kill two birds with one stone. In lieu of a copper driver casing -- which I've only seen Rick Trent carry -- something else you could try is connecting the back of one copper module to the other:



You can use thermal adhesive/grease to make a better contact. Also, most of those brass driver cases have enough threading that if you were to chop off the back, you could use the threaded section to connect the two modules like this:



All it would cost you is a second copper module, a brass casing, and some sort of cutting tool. It'd be much better if the brass threading were made of copper or something better, but it is still better than just air, and would mechanically hold the two modules snug against each other in addition to the thermal grease.
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Old 03-24-2014, 01:12 AM #10
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Default Re: Best thermal pathway for heatsinks

look at this one the back of diode will touch the 2 part copper heat sink
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Old 03-24-2014, 05:51 AM #11
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Default Re: Best thermal pathway for heatsinks

I wish a copper module casing was the standard.
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Old 03-24-2014, 05:55 AM #12
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Default Re: Best thermal pathway for heatsinks

@ B-B

for your suggestion, would not one of the modules need to be for a smaller size diode? otherwise, it would not contact the back of the diode right? lets say a 9mm diode is used. would the second module need to be a 5.6mm, or could a 3.8mm work too?
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Old 03-24-2014, 06:01 AM #13
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Default Re: Best thermal pathway for heatsinks

Anyone know what the rear thread pitch of standard Aixiz modules is? We should make a better back.
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Old 03-24-2014, 06:41 AM #14
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Default Re: Best thermal pathway for heatsinks

Quote:
Originally Posted by Shakenawake View Post
@ B-B

for your suggestion, would not one of the modules need to be for a smaller size diode? otherwise, it would not contact the back of the diode right? lets say a 9mm diode is used. would the second module need to be a 5.6mm, or could a 3.8mm work too?
I'd probably just keep it the same size unless you could be sure that the 3.8mm hole wouldn't cause any shorts with the pins in the back. I'm not sure if the smaller hole would make any different either because the diodes are usually pressed below the edge of the hole in the back, leaving a small gap.

Quote:
Originally Posted by rhd View Post
Anyone know what the rear thread pitch of standard Aixiz modules is? We should make a better back.
I think Mohrenberg might know, since he had a GB for some of these to be manufactured. We could use the opportunity to create more solid copper backs too, not just the thin-walled variety like the current brass backs.
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Old 03-24-2014, 06:58 AM #15
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Default Re: Best thermal pathway for heatsinks

Bionic:
That was my thinking also.

I know that the back thread info actually exists in a post on LPF somewhere - I've seen it before - but it seems to be resistant to searches.
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SAFETY & IMPORTANT READING (threads authored and contributed to by various members of LPF):
- Federal Aviation Administration - Laser Safety Initiative (link)
- Info release from Laserglow - Default Canadian restrictions on portable lasers (link)
- The Necessity of Safety Goggles (link)

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Old 03-24-2014, 07:03 AM #16
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Default Re: Best thermal pathway for heatsinks

From an email from DTR a while back,

Back threads are M11x0.5mm
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