Advice needed on cooling a multi diode setup

[Badpip]

Just recieved some of Dave's new lenses and mounts.

Now it's time to build some red

I'll combine 3 LOCs - two knife-edged, and the last one PBS'ed for a nice 2x1.5mm beam.

But before the fun can begin, I have to plan the layout.

I have a handful of 20x20mm 7W TECs to keep things cool.

But: What is the best way to cool it? A TEC under each diode-mount, or cooling the entire baseplate?

Any recommendations on temperature to run LOCs at?

They will be running at around 400mA.

/Thomas

[edison]

Most diodes are performing best at 25 degrees. I prefer 23 degrees to stretch the lifetime of the diode. I guess you have a baseplate with diodemounts so to cool each diode is the best in your situation.

[Badpip]

Most diodes are performing best at 25 degrees. I prefer 23 degrees to stretch the lifetime of the diode. I guess you have a baseplate with diodemounts so to cool each diode is the best in your situation.

Thanks for the info

The diode-mounts goes on a small 8mm aluminum plate to form a module - I'm not talking about cooling the projector base plate, sorry if I was unclear... Cooling each diode would probably be the easiest thing to do - I've just seen a lot of people placing a TEC under the whole assembly, and wondered if it would be better.

/Thomas

[allthatwhichis]

I have no advice, but can show you the set up Kvant uses on their 3 diode red blue laser head that uses two 640 reds and a 445 blue. they use one TEC for all 3 diodes.

[Badpip]

I have no advice, but can show you the set up Kvant uses on their 3 diode red blue laser head that uses two 640 reds and a 445 blue. they use one TEC for all 3 diodes.

Cool - thanks!

3 diodes in one block, on one big TEC... As I only have small TECs, I'll put one under each diode as per edison's advice

Now I'll start building

/Thomas

[Doc]

Cool - thanks!

3 diodes in one block, on one big TEC... As I only have small TECs, I'll put one under each diode as per edison's advice

Now I'll start building

/Thomas

The benefit of cooling the entire assembly is more stable alignment, you pays your money......

[logsquared]

In my experience cooling the hole baseplate is a must. If you put the tec under just the diodes then your baseplate temp is going to go up. The amount of temp rise will depend on several factors. If you don't remove the heat somehow it will heat your mirror mounts and throw of your alignment. In my opinion you would be better off with no TEC, rather than putting them under just the diodes. Just my take on it... everyone does things different.

[dave]

Another vote for cooling the entire thing.. its going to be much easier to keep stable and build as well

[Badpip]

Looks like the majority recommends cooling the whole thing - didn't think about walking optics, but it makes sense.

Cooling the whole thing it is! Thanks for all inputs!

/Thomas

[andy_con]

your going to combine three loc red diode which can operate up to 70degrees i think it is.

id save your money and not bother tec'ing. all you need is decent diode holders and a decent base plate.

three loc will not produce hardly any heat and will not affect alignment.

kvant use 642nm diodes we have a completely different spec to loc's.