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Old 10-18-2013, 06:41 PM #1
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Red face Stell heat sink is very bad?

I'm novice at lasers.

Foolishly, I bought a steel heat sink. I was excited and I rammed diode heat sink. All assembled. It works. After 15-20 seconds, it starts to warm up.

I read the forums and see all the copper heat sink.
I saw a table of thermal conductivity. But this theory. And I'm interested in the practice. What I am threatened with a steel heat sink?

Will save the active Car cooling air? (a powerful fan)

I plan to show the device and the laser must be enabled continuously for about 3 minutes.




Last edited by trawen; 10-18-2013 at 06:45 PM.
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Old 10-18-2013, 07:08 PM #2
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Default Re: Stell heat sink is very bad?

That is not steel. The material is made of brass with an outer layer of chrome or nickel.
It can be used for making a laser. You will need a bigger heatsink around that module.
Preferable with a large surface area. Like the one in my picture. With a heatsink that big you don't need an active cooling like a fan.

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Old 10-18-2013, 07:17 PM #3
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Default Re: Stell heat sink is very bad?

That is just a module, it's purpose is to hold the diode and the lens barrel, you'll need a heat sink on the module if you're dissipating a lot of power.
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Old 10-18-2013, 07:17 PM #4
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Default Re: Stell heat sink is very bad?

The fact that the laser is mounted on a rotational platform. It rotates at a speed of several thousand revolutions per minute (very quickly!). Thus the laser itself acts as a cooler.

By the way this is not brass. I tried it nag rasp. Inside the metal-such as color.
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Old 10-18-2013, 07:19 PM #5
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Default Re: Stell heat sink is very bad?

Can you show us a picture of your set up?
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Old 10-18-2013, 07:29 PM #6
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Default Re: Stell heat sink is very bad?

it looks like this.

two lasers and two drivers and a battery cut will be attached on an aluminum disk the size of a CD. Disk is mounted on the motor shaft.

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Old 10-18-2013, 07:34 PM #7
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Default Re: Stell heat sink is very bad?

Inside the heat sink is empty. I filled the back thermal glue. What would the heat from the foot diode transmitted through glue to the body.
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Old 10-18-2013, 08:51 PM #8
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Default Re: Stell heat sink is very bad?

Thermal paste is not an effective heat transfer medium... It is designed only to fill the tiny gaps between two metal surfaces. Its thermal transfer properties are extremely poor compared to aluminum/brass/copper/etc.

You will likely need better heatsinking than the bare module if you plan to drive the diode at more than say 100mA.
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Old 10-18-2013, 08:55 PM #9
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Default Re: Stell heat sink is very bad?

Well, I tested the 1000 ma.

Does anyone know of an acceptable temperature of the diode?
I think you can hang a temperature sensor and control it.
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Old 10-18-2013, 08:57 PM #10
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Default Re: Stell heat sink is very bad?

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Originally Posted by MarioMaster View Post
Thermal paste is not an effective heat transfer medium...
I understand that. But I think it's better than air.
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Old 10-18-2013, 09:02 PM #11
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Default Re: Stell heat sink is very bad?

A small heat sink like this
660nm 5 6mm Laser Diode Module Host ?12MMX30MM Aluminum Host W H Heatsink Lens | eBay

or this
Cooling Heatsink Suitable FOR 12mm Laser Diode Module | eBay

would help greatly as it increases the surface area of the metal in contact with the air and will keep it cooler.
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Old 10-18-2013, 09:09 PM #12
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Default Re: Stell heat sink is very bad?

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Originally Posted by ARG View Post
I had and bought it.

but the seller is an asshole! sent without aluminum. (
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Old 10-18-2013, 09:15 PM #13
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Default Re: Stell heat sink is very bad?

I think I can make myself a radiator.
Take an ordinary piece (from computer or videocard) and drill a hole in it.
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Old 10-19-2013, 01:05 AM #14
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Default Re: Stell heat sink is very bad?

use these to mount your modules to the disk so that the disk also becomes a big heatsink.

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Old 10-19-2013, 09:51 AM #15
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Default Re: Stell heat sink is very bad?

See if you can find a metal disc such as a hard drive platter. That will also help dissipate the heat.
Plus you can also use the disc itself as a slip ring.
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