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Old 04-04-2016, 03:37 AM #97
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Default Re: Portable FAP Red

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


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Old 04-09-2016, 02:33 AM #98
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Default Re: Portable FAP Red

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??
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Old 04-09-2016, 03:28 AM #99
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Default Re: Portable FAP Red

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?
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Old 04-09-2016, 03:44 AM #100
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Default Re: Portable FAP Red

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 :-(
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Old 04-09-2016, 04:45 AM #101
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Default Re: Portable FAP Red

I've used Arctic Silver on one of my FAP's and it didn't do anything to my optics. Of course the best thing to use is a thin sheet of Indium.

Edit: Here's a sheet on ebay http://www.ebay.com/itm/Indium-metal...-/141359505457
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Old 04-09-2016, 08:35 PM #102
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Default Re: Portable FAP Red

I ordered that last night. Almost like buying gold!
Will 0.003" thickness be enough? I did lap the heatsink.
HMike
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Old 04-10-2016, 06:02 AM #103
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Default Re: Portable FAP Red

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.
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Old 04-24-2016, 01:24 AM #104
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Default Re: Portable FAP Red

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 :-)
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Old 04-24-2016, 02:39 AM #105
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Default Re: Portable FAP Red

Yay, I've been worried something happened since you have been silent so long.
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Old 04-24-2016, 02:43 AM #106
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Default Re: Portable FAP Red

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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Old 04-24-2016, 03:13 AM #107
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Default Re: Portable FAP Red

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.
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Old 04-24-2016, 12:01 PM #108
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Default Re: Portable FAP Red

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.
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"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

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Old 04-25-2016, 04:10 AM #109
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Default Re: Portable FAP Red

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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Old 04-26-2016, 02:20 AM #110
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Default Re: Portable FAP Red

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
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Last edited by Hemlock_Mike; 04-27-2016 at 04:34 AM.
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Old 04-27-2016, 06:59 PM #111
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Default Re: Portable FAP Red

Thanks PED- That AH trashed my file!!
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Old 04-28-2016, 03:12 AM #112
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Default Re: Portable FAP Red

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.
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Last edited by Hemlock_Mike; 04-28-2016 at 03:15 AM.
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