Old 11-13-2011, 02:32 AM #1
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Default Question about heat sinking a desktop laser

Ok my original plan was to put a 445nm diode in a 12mm aixiz module in a CPU heat sink like this


but then I figured instead I could just use a brick of copper. Now my question is this. Which one will provide better heat sinking capability. I would assume the brick is better but I'm not sure that it would be as good as a radial CPU heat sink with a fan. So what are everyones thoughts on this?


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Laserglow- 532nm lab 2,500mW output= 2,573mW
Meierlight- 532nm lab 1,800mW output=2,000mW+
Survival Laser- 445nm 1-1.3W output= 1,153mW
DIY bench top- 445nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 2,000mW+Power graph
DIY bench top- 445nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 1,634mW Power graph
Danefex-445nm Minisabre V2 output=1,736mW
SkyraySR5-445nm 2W diode and host from DTR output=2,231mW
DIY bench top- 650nm in mini cylindrical CPU heat sink. Diode from lazerer. Focusing ring from FlaminPyro Output=304mW
DIY bench top- 635nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from Flaminpyro. Output=I've pushed it to 576mWPower graph
SkyraySR5-635nm 300mW diode from DTR output=
DIY bench top- 405nm in cylindrical CPU heat sink 12X diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 552mWPower graph
Lazerer- 405nm Rifle 500mW. Actual output=551mW
DIY 40W Co2


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Old 11-13-2011, 02:39 AM #2
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Default Re: Question about heat sinking a desktop laser

The purpose of the heat sink is to transfer the heat from the metal to the air, having more surface area means better heat sinking, so the CPU H/S would work better.
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Old 11-13-2011, 03:00 AM #3
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Default Re: Question about heat sinking a desktop laser

Definately the CPU sink, especially if it is fan cooled.
A brick of copper will transfer heat, but if the heat is not dispersed, the temperature of the whole assembly will rise.

I have a CPU sink that has a copper core and aluminum, fan-cooled fins.
Best of both worlds right there. It's like it was designed to do that...
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615mw 405nm/12X Spiderfire X-03
148mw 405nm/GGW in my "Hotlight-Saber" host
1920mw 445nm River Rock custom
1530mw 445nm Yobresal
1360mw 445nm Qumefox Sipik
800mw 445nm WL Arctic Spyder S3
240mw 473nm CNI Labby
8mw 473nm CNI Labby
528mw 532nm Lazerer Cannon
310mw 532nm Firedragon III
300mw 532nm CNI Labby
180mw 532nm SKY Laser
4x 147-267mw 532nm Waterproof
900mw 635nm in Temporary Finned Labby Sink
Several 635nm diodes awaiting a build
500mw 650nm Dual LPC-826 Labby
251mw 650nm/LPC-815 Ultrafire U-501B
Several 685nm diodes awaiting a build
3W 808nm diode awaiting build

Kenometer w/ Coherent Thermopile 10W
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Old 11-13-2011, 03:49 AM #4
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Default Re: Question about heat sinking a desktop laser

Quote:
Originally Posted by rocket689 View Post
Definately the CPU sink, especially if it is fan cooled.
A brick of copper will transfer heat, but if the heat is not dispersed, the temperature of the whole assembly will rise.

I have a CPU sink that has a copper core and aluminum, fan-cooled fins.
Best of both worlds right there. It's like it was designed to do that...
Thanks man, i have the same h's from my pc.. It wasnt good enough for overclocking but i think i just found out a use for it
Will i be able to run at max current with unlimited duty cycles ? i have a 660nm LPC diode, which is desperately in need of some power :P
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Old 11-13-2011, 03:53 AM #5
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Default Re: Question about heat sinking a desktop laser

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Originally Posted by sinner View Post
Thanks man, i have the same h's from my pc.. It wasnt good enough for overclocking but i think i just found out a use for it
Will i be able to run at max current with unlimited duty cycles ? i have a 660nm LPC diode, which is desperately in need of some power :P
The LPC 815 or LPC 826 both put out a small amount of heat at the 400-450 ma they usually max at.
So, the diode will be plenty good with a huge heatsink like that.

It's the driver that I would be concerned about overheating on long or unlimited duty cycles.
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Would you like to purchase some M-140 445nm diodes (individual or pressed into Aixiz or pure copper module) at very reasonable prices? PM me if you are interested!

My laser list has become way too big; I'm listing some of my favorites out of my extensive collection.
615mw 405nm/12X Spiderfire X-03
148mw 405nm/GGW in my "Hotlight-Saber" host
1920mw 445nm River Rock custom
1530mw 445nm Yobresal
1360mw 445nm Qumefox Sipik
800mw 445nm WL Arctic Spyder S3
240mw 473nm CNI Labby
8mw 473nm CNI Labby
528mw 532nm Lazerer Cannon
310mw 532nm Firedragon III
300mw 532nm CNI Labby
180mw 532nm SKY Laser
4x 147-267mw 532nm Waterproof
900mw 635nm in Temporary Finned Labby Sink
Several 635nm diodes awaiting a build
500mw 650nm Dual LPC-826 Labby
251mw 650nm/LPC-815 Ultrafire U-501B
Several 685nm diodes awaiting a build
3W 808nm diode awaiting build

Kenometer w/ Coherent Thermopile 10W
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Old 11-13-2011, 04:06 AM #6
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Default Re: Question about heat sinking a desktop laser

Aluminum h's , and a good old lm317 (japan made) .. chinese ones overheat after 1minute, this one is worked for about 4minutes with a moderate heating up at 480mA,
so i guess it will work even better with those aluminum h's
..and unlimited duty cycles like 10~15min , in my case.. after that i may get a bit ..cant say boring.. but less interesting
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Old 11-13-2011, 04:45 PM #7
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Default Re: Question about heat sinking a desktop laser

Thanks for the feedback everyone. I assumed the finned heat sink would be better but I didn't know if a large enough brick would do a better job drawing heat from the module quickly. The heat sink i am planning on using is actually this one.
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Dragon Lasers- 532nm viper 35mW output=67mW
Dragon Lasers- 532nm Hulk 100mW output=213mW
Laserglow- 532nm lab 2,500mW output= 2,573mW
Meierlight- 532nm lab 1,800mW output=2,000mW+
Survival Laser- 445nm 1-1.3W output= 1,153mW
DIY bench top- 445nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 2,000mW+Power graph
DIY bench top- 445nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 1,634mW Power graph
Danefex-445nm Minisabre V2 output=1,736mW
SkyraySR5-445nm 2W diode and host from DTR output=2,231mW
DIY bench top- 650nm in mini cylindrical CPU heat sink. Diode from lazerer. Focusing ring from FlaminPyro Output=304mW
DIY bench top- 635nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from Flaminpyro. Output=I've pushed it to 576mWPower graph
SkyraySR5-635nm 300mW diode from DTR output=
DIY bench top- 405nm in cylindrical CPU heat sink 12X diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 552mWPower graph
Lazerer- 405nm Rifle 500mW. Actual output=551mW
DIY 40W Co2



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Old 11-13-2011, 04:48 PM #8
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Default Re: Question about heat sinking a desktop laser

Quote:
Originally Posted by sopark4000 View Post
Thanks for the feedback everyone. I assumed the finned heat sink would be better but I didn't know if a large enough brick would do a better job drawing heat from the module quickly. The heat sink i am planning on using is actually this one.
Yes, a brick of copper would draw the heat away more quickly.
BUT, once the brick became thermally saturated, it would hold the heat.
Surface area and air flow is just as important for long duty cycles.

It also depends on how much heat your setup is outputting....
__________________
Would you like to purchase some M-140 445nm diodes (individual or pressed into Aixiz or pure copper module) at very reasonable prices? PM me if you are interested!

My laser list has become way too big; I'm listing some of my favorites out of my extensive collection.
615mw 405nm/12X Spiderfire X-03
148mw 405nm/GGW in my "Hotlight-Saber" host
1920mw 445nm River Rock custom
1530mw 445nm Yobresal
1360mw 445nm Qumefox Sipik
800mw 445nm WL Arctic Spyder S3
240mw 473nm CNI Labby
8mw 473nm CNI Labby
528mw 532nm Lazerer Cannon
310mw 532nm Firedragon III
300mw 532nm CNI Labby
180mw 532nm SKY Laser
4x 147-267mw 532nm Waterproof
900mw 635nm in Temporary Finned Labby Sink
Several 635nm diodes awaiting a build
500mw 650nm Dual LPC-826 Labby
251mw 650nm/LPC-815 Ultrafire U-501B
Several 685nm diodes awaiting a build
3W 808nm diode awaiting build

Kenometer w/ Coherent Thermopile 10W
LaserBee 2.5W USB LPM
Radiant Alpha 2W LPMSOLD=Now in Kuwait!
1.2W RGB Projector; JNM Wide Sky Galvos (Made in Germany); Laser Show Express; Arduino-based DAC

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Old 11-13-2011, 05:34 PM #9
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Default Re: Question about heat sinking a desktop laser

Quote:
Originally Posted by rocket689 View Post
Yes, a brick of copper would draw the heat away more quickly.
BUT, once the brick became thermally saturated, it would hold the heat.
Surface area and air flow is just as important for long duty cycles.

It also depends on how much heat your setup is outputting....
I'm planning on running a 445nm between 800-1,000mW with the hopes of having pretty much unlimited duty cycle while using the fan, although I don't see myself running it for more than 20 minutes at a time which it should handle.
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MY LASERS
Dragon Lasers- 532nm viper 35mW output=67mW
Dragon Lasers- 532nm Hulk 100mW output=213mW
Laserglow- 532nm lab 2,500mW output= 2,573mW
Meierlight- 532nm lab 1,800mW output=2,000mW+
Survival Laser- 445nm 1-1.3W output= 1,153mW
DIY bench top- 445nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 2,000mW+Power graph
DIY bench top- 445nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 1,634mW Power graph
Danefex-445nm Minisabre V2 output=1,736mW
SkyraySR5-445nm 2W diode and host from DTR output=2,231mW
DIY bench top- 650nm in mini cylindrical CPU heat sink. Diode from lazerer. Focusing ring from FlaminPyro Output=304mW
DIY bench top- 635nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from Flaminpyro. Output=I've pushed it to 576mWPower graph
SkyraySR5-635nm 300mW diode from DTR output=
DIY bench top- 405nm in cylindrical CPU heat sink 12X diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 552mWPower graph
Lazerer- 405nm Rifle 500mW. Actual output=551mW
DIY 40W Co2


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Old 11-13-2011, 07:17 PM #10
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Default Re: Question about heat sinking a desktop laser

This sounds like an excellent application for a water cooling system.. although that may be overkill.
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Old 11-13-2011, 09:13 PM #11
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Default Re: Question about heat sinking a desktop laser

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This sounds like an excellent application for a water cooling system.. although that may be overkill.
Lol. Ya think?
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Would you like to purchase some M-140 445nm diodes (individual or pressed into Aixiz or pure copper module) at very reasonable prices? PM me if you are interested!

My laser list has become way too big; I'm listing some of my favorites out of my extensive collection.
615mw 405nm/12X Spiderfire X-03
148mw 405nm/GGW in my "Hotlight-Saber" host
1920mw 445nm River Rock custom
1530mw 445nm Yobresal
1360mw 445nm Qumefox Sipik
800mw 445nm WL Arctic Spyder S3
240mw 473nm CNI Labby
8mw 473nm CNI Labby
528mw 532nm Lazerer Cannon
310mw 532nm Firedragon III
300mw 532nm CNI Labby
180mw 532nm SKY Laser
4x 147-267mw 532nm Waterproof
900mw 635nm in Temporary Finned Labby Sink
Several 635nm diodes awaiting a build
500mw 650nm Dual LPC-826 Labby
251mw 650nm/LPC-815 Ultrafire U-501B
Several 685nm diodes awaiting a build
3W 808nm diode awaiting build

Kenometer w/ Coherent Thermopile 10W
LaserBee 2.5W USB LPM
Radiant Alpha 2W LPMSOLD=Now in Kuwait!
1.2W RGB Projector; JNM Wide Sky Galvos (Made in Germany); Laser Show Express; Arduino-based DAC
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Old 11-13-2011, 09:31 PM #12
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Default Re: Question about heat sinking a desktop laser

But it sounds cool. Anything that is water cooled sounds cooler then its counterpart that is not.

That's why I water cooled my desktop when I was getting my computer degree. If you start talking about Mhz and dpi it goes over most people's heads... but just tell people your thing is water cooled and they are automatically impressed.
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Old 11-14-2011, 12:35 AM #13
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Default Re: Question about heat sinking a desktop laser

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Originally Posted by Ablaze View Post
But it sounds cool. Anything that is water cooled sounds cooler then its counterpart that is not.

That's why I water cooled my desktop when I was getting my computer degree. If you start talking about Mhz and dpi it goes over most people's heads... but just tell people your thing is water cooled and they are automatically impressed.
Speaking of water cooled laser heat sinks I'm curious how this thing works.

HIGH POWER TO3 LASER DIODE WATER COOLED HEAT SINK on eBid United States

It's meant to be used with laser diodes but I don't quite understand how.

EDIT- Obviously I understand what the hoses are for, I just don't understand how you attach it to a diode.
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Last edited by sopark4000; 11-14-2011 at 12:39 AM.
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Old 11-16-2011, 05:19 PM #14
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Default Re: Question about heat sinking a desktop laser

CPU heatsinks, technically, are overkill as well. They are meant to dissipate what, 90W? 125W?

Our 445nm diodes use around 5-6W on average

Water cooling probably doesn't apply to to56. If you had a high power die, you'd mount it in something other than a to56 because other packages are better at dissipating heat.

Edit: I see in the link it is for TO-3 laser diodes.
Not my image, so I'm not hotlinking, but in the following image, there are the main types of diode packages: http://www.lasermate.com/cp-L081-1.jpg
TO-3 are the ones on the top. Big heat spreader and holes for bolts make it a good heat dissipating package.
TO-9 is a scaled up version of the TO-56, where the 5.6mm diameter is scaled up to 9mm and all other dimensions are scaled up by the same ratio, and is in the bottom-left of that picture.
C-mount is the bottom-right. Since the diode heat spreader is bolted down to the mounting plate with high pressure, it makes a better thermal contact than the TO-9 or TO-56.

Last edited by BShanahan14rulz; 11-16-2011 at 05:27 PM.
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