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Old 09-01-2016, 01:01 AM #1
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Default Need Advice For 5W C Mount

After building a decent amount of visible laser pointers, I want to build an IR laser using this: 5W 808nm C Mount Laser Diode CW Semiconductor Diode TO3 SEALED w H Fac Lens | eBay . Are there any combiners that can collimate separate c mount or to3 packages into a single beam? My goal is for the beam to be able to melt soldering paste. I have seen other posts that used visible lasers for soldering, but none with infrared.


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Old 09-01-2016, 02:04 AM #2
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Default Re: Need Advice For 5W C Mount

I haven't seen any fiber combiners which can be had to add to a IR diode, but you can buy FAP800 IR modules cheap enough on ebay. However, get a guarantee, if you can, that all of the diodes on the unit are good or you might have a dark fiber as shown in a photo at this link: Coherent 808nm/IR Fiber Array Package Beam Shot (Movie added to thread).
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Old 09-01-2016, 03:45 AM #3
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Default Re: Need Advice For 5W C Mount

Thanks for sharing. I never seen the FAP800 modules before. Have you ever bought from directly from Coherent because I cant find any prices on their site?
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Old 09-01-2016, 03:51 AM #4
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Default Re: Need Advice For 5W C Mount

I would never order directly from Coherent as a hobbyist, I've been able to find their products used on ebay with success, only bought one FAP800 with a dark fiber on it so far and have found several of them on ebay. I just bought a 25 watt output FAP600 on ebay for 150 dollars a few days ago and from an ex employee of that company which was "new" old stock, so no run time and at a fraction of the cost of new.
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Old 09-01-2016, 04:08 AM #5
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Default Re: Need Advice For 5W C Mount

Il stick with ebay then. I should be able to find one with a lens or collimator of some kind.
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Old 09-01-2016, 04:18 AM #6
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Default Re: Need Advice For 5W C Mount

You might find a FAP and then have to go looking for a collimator, this seller used to sell SMA threaded collimators for them: http://stores.ebay.com/Purple-Dragon...p2047675.l2563
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Old 09-01-2016, 04:23 AM #7
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Default Re: Need Advice For 5W C Mount

Ok. Thank you for the help.
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Old 09-01-2016, 05:02 AM #8
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Default Re: Need Advice For 5W C Mount

Quote:
Originally Posted by thebouljello View Post
Il stick with ebay then. I should be able to find one with a lens or collimator of some kind.
Best thing with eBay is that should something go wrong they'll have your back. Every purchase is backed with their delivery guarantee which I've had to resort to in the past with a chinese seller that never shipped. If the seller refuses a refund eBay will give you your money and then deal with the seller themselves, great customer service from them
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Old 09-01-2016, 02:32 PM #9
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Default Re: Need Advice For 5W C Mount

If this (and my experiences) are anything to go by, 5W will be plenty on it's own so no need to combine them.

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Old 09-01-2016, 05:44 PM #10
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Default Re: Need Advice For 5W C Mount

Thanks for the ideas and suggestions. In diachi's link, there is a video of a combined 6w laser melting soldering paste. I wonder what the condition of the lenses are like after the vapors coming into contact with the lenses.
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Old 09-02-2016, 08:26 AM #11
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Default Re: Need Advice For 5W C Mount

5 watts is a lot for warming or melting paste, maybe too much.
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Old 09-02-2016, 11:22 AM #12
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Default Re: Need Advice For 5W C Mount

I am going to use virtual goggles with unfiltered CCD cams so I can see the beam in action and focus it live, also you can have a 2nd cam at your target and switch back and forth, adding a micro SD card to record to should be included or easily added via the AV jack.

I will be very careful with near IR, one slip up could mean a severe lifelong injury.

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Old 09-02-2016, 01:52 PM #13
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Default Re: Need Advice For 5W C Mount

If I do start working with 5W IR lasers, I was planning on getting eagle pair goggles and a sort of mask around it so my eyes would be sealed from the sides and top. Virtual goggles with a ccd camera like red cowboy mentioned sounds like a good idea.
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Old 11-14-2016, 01:11 AM #14
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Default Re: Need Advice For 5W C Mount

Its been 2 months but I have an update. I found this SMDLTLFP Chip Quik Inc. | Soldering, Desoldering, Rework Products | DigiKey soldering paste on digikey with a melting point of 138C and 281F, which is significantly lower than other soldering paste and much lower than metal solder. A 5w 808nm with a FAC lens should be able to melt tiny blobs (about 1sq mm) of this solder in a reasonable amount of time.
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Old 11-14-2016, 05:16 AM #15
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Default Re: Need Advice For 5W C Mount

A 5 watt IR diode will probably vaporize the material, if focused into a tiny point upon it. Might want to expand your beam some to lower the power density to keep that from happening. A 10mm diameter spot from a 5 watt laser beam will be hot, a .25mm focused spot 40 times the power density, poof!
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