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Portable FAP Red

Hemlock_Mike

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Chris -- I'll use a small thermocouple
for quick response. -- HMike
 



Hemlock_Mike

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I called Coherent again today and this time I was told NOT to use the Acetone on the fibers for cleaning. Use only lab grade Methanol. I suspected that.
NOW -- I'm using Dow Corning #340 Silicone heat sink compound between the module and the HS. Has anyone ever had an optic problem using this product in proximity? I read the spec data and it appears that there is a volatile component in it which I think could coat an optic. -- Anyone??
HMike

I ordered some arctic silver 5 -- Specs look better.
 
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Alaskan

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I've heard not to use heat sink compounds with lasers because it can migrate to the laser diode, but with a FAP? I don't really have much concern myself, anyone?
 

Hemlock_Mike

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This Arctic 5 is mostly silver and is not supposed to migrate, It would have to go a long way to get to the fiber output. By the way, this is not the two part Arctic 5 glue.
I just don't want fumes condensing on the optics. I've become paranoid :-(
HMike

Someday, I'll be able to send rep!!!
 
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Hemlock_Mike

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I ordered that last night. Almost like buying gold!
Will 0.003" thickness be enough? I did lap the heatsink.
HMike
I still can't sent you + rep. I'm too busy to read and rep everything else.
 
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Alaskan

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Great, for a single sheet of Indium, I didn't think 20 was bad at all, I bought a few sheets some time back but everything packed away now. On my way to GA tonight, will meet with RedCowboy while down there for two weeks.
 

Hemlock_Mike

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Chris -- I finally got my Indium foil today and have mounted an FAP
on the heat sink. I will connect a K thermocouple to monitor my
blower heatsink.
Now tests can begin !!! I retire in two months :)
HMike
 

Alaskan

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Yay, I've been worried something happened since you have been silent so long.
 

Hemlock_Mike

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It takes forever to get the stuff of science from the net.
I need to connect my K probe to the module/heatsink.
Do you have a 445 or 405 laser?
HMike
I'm going to clean the output and then run it open to
measure temperatures with this blower heatsink.
 
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Hemlock_Mike

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Here it is with the FAP module mounted to the HS with Indium.



There is enough wire to monitor the current with my DC Amp clamp.
I plan to use a dab of Arctic 5 for the temp probe.
 

Alaskan

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I don't have any lasers with me on my way to Afghanistan soon and in Texas processing through an Army base right now, but I do have a 450nm laser at home in Alaska. Looks like everything will fit together nicely in a pointer, I'm just concerned how long the duty cycle can be with that heat sink being so small, even with a fan on it, but as you said, you are not shooting for a long duty cycle.
 

Hemlock_Mike

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Chris -- I'll send you the "toy" when you get back -- GOD SPEED to you.
If my heat sink will hold it to about 90 Degrees for 10 seconds, I'll be happy.
I can always make another larger unit. For now, I need to find out what split
and shorted my 78L05 when it only has a 3K ohm load on it.I hope it didn't damage
the PS module although it seems to remain limiting the current to my set point.
Good Luck -- Mike
 
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Hemlock_Mike

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I removed the PS and found a broken ground connection to the 78L05. I replaced the regulator, checked a bunch of crap and powered it up into a dummy load --- It still seems to work :) Now to put it all back together.....
Damned perf board circuits........
HMike
Spam crap follows. Bastard ------------
 
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Hemlock_Mike

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I have the laser running now with a MAX current of 34 Amps off the cells. I still want to make the PTH08 module closer to CC rather than CV. I will call TI and ask about that.
I haven't yet run Current vs Temp over time yet but it appears slow to heat up and SLOW to cool with the fan on.
I used a 75 mm FL lens at 25 Amps tonight and it focuses to a point and burns good. I now need to try the fiber cable to see if it will smooth out the 19 point beam. The specs say operating temp is 86 Deg F ??? Thanks to global cooling in this area, I might be able to run this for a few seconds occasionally in the summer.
HMike
 
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