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Old 10-05-2009, 08:22 PM #1
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Default Getting a coherant 40w 808nm

I'm getting a coherent Fiber module, 40w part # 1057814 808nm at 40W
http://www.coherent.com/downloads/FA...es_DSFinal.pdf

I'm curious if anyone has any experience with these and making burning lasers from them. I'm trying to put together a micro soldering device and I hope this is going to be sufficient wattage to do so.

The requirements says 2.2V @ 9-13A threshold but 53A as it's max, does that mean the more amps I put in the more power output I get?

Also does anyone have any recommendations for SMA optics/collimators, etc.
the module I'm getting appears to have TEC cooling already part of it but it's recommending a 100W heatsinc. Still a noob here, how can I measure or determine the watts a sinc can draw away?


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Old 10-05-2009, 08:32 PM #2
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Default Re: Getting a coherant 40w 808nm

Well, the threshold means that it will start lasing at that current, but to achievement 40W you need power it at 50-53A at it says in that pdf. You don't need to worry about the voltage, you need only to be sure about the current.
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Old 10-05-2009, 08:35 PM #3
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Default Re: Getting a coherant 40w 808nm

Ok, here's the real question, is there any feasible way to get about 50 amps from batteries? I'd like to make it portable for soldering away from a bench.
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Old 10-05-2009, 08:43 PM #4
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Default Re: Getting a coherant 40w 808nm

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Ok, here's the real question, is there any feasible way to get about 50 amps from batteries? I'd like to make it portable for soldering away from a bench.
Not really :P It would be hard drain such current from car battery (depends on type) constantly, but it is possible (I mean we would had to make some sort of boost down driver to 2.2V instead of 12V so it would drain less current drain from battery).
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Old 10-05-2009, 08:55 PM #5
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Default Re: Getting a coherant 40w 808nm

LV128 - When it comes to IR diodes, the max current is usually the max; you can put more current in but it won't output much more. I think you need to worry more about the type of driver you're gonna use; 50A drivers aren't widely available nor are they simple to build... Have you also considered the absorbtion of energy of the material you're soldering?
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Old 10-05-2009, 08:56 PM #6
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Default Re: Getting a coherant 40w 808nm

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Ok, here's the real question, is there any feasible way to get about 50 amps from batteries? I'd like to make it portable for soldering away from a bench.
No, you need a current regulated power supply to run this with any hope of long life. It is not an appropriate use to make a portable laser out of this diode, anybody in line of sight would need eye protection.
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Old 10-05-2009, 09:11 PM #7
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Default Re: Getting a coherant 40w 808nm

Is eye protection for other people mandatory even though it's going to be used as a soldering tool? usually about 1" away from the workpiece?
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Old 10-05-2009, 11:05 PM #8
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Default Re: Getting a coherant 40w 808nm

Yes, the solder is a reflective metal, when you melt it, it can flow in any direction and scatters the light in random directions.
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Old 10-05-2009, 11:58 PM #9
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Default Re: Getting a coherant 40w 808nm

They work good for soldering machines, It is best to put it in a class 1 enclosure though since the glasses that filter out 808 to the degree required to protect your eyes are pretty dark.
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Old 10-06-2009, 02:48 AM #10
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Default Re: Getting a coherant 40w 808nm

anyone have any suggestions for adding a red dot to this unit for targeting?
Good point on the solder flowing aspect, didn't think of that.
Still would need a pretty big power supply for this too...
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Old 10-06-2009, 03:06 AM #11
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Default Re: Getting a coherant 40w 808nm

You will probably need a much longer wavelength laser (CO2) if you plan on soldering with it. As I have mentioned before, solder/solder paste probably doesn't absorb 808nm; most of it (if not all) will be reflected.
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Old 10-06-2009, 03:35 PM #12
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Default Re: Getting a coherant 40w 808nm

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You will probably need a much longer wavelength laser (CO2) if you plan on soldering with it. As I have mentioned before, solder/solder paste probably doesn't absorb 808nm; most of it (if not all) will be reflected.
I did look into this, although I've been informed in another post that there's not way to make a co2 flexible with fiber optic since the optics would also be opaque to the 10600nm beam and would just melt. So while solder is a metal, I've never really looked into it's reflective index, it is rather dull when solid and does absorb some heat from my 405nm attempts at heating it (not enough energy of course). Molten solder is completely different though.

I need to do more research....
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Old 10-06-2009, 11:32 PM #13
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Default Re: Getting a coherant 40w 808nm

solder paste works just fine with 808, but even better with 930-960nm lasers.
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Old 10-06-2009, 11:56 PM #14
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Default Re: Getting a coherant 40w 808nm

My 2W 808 melts solder, as does my 4W 960. With 40W you should be able to solder, just don't blow a hole through the PCB or a component ... You will of course need a length of fiber and a handpiece of some sort.
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Old 10-07-2009, 06:05 AM #15
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Default Re: Getting a coherant 40w 808nm

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No, you need a current regulated power supply to run this with any hope of long life. It is not an appropriate use to make a portable laser out of this diode, anybody in line of sight would need eye protection.
Along with a nice big heatsink or water cooling rig.

Sure you can make it portable, but walk around while using it, portable, no.
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Old 10-07-2009, 06:09 PM #16
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Default Re: Getting a coherant 40w 808nm

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Along with a nice big heatsink or water cooling rig.

Sure you can make it portable, but walk around while using it, portable, no.

If it's a coherent fibre coupled laser it will probably be an 800 series FAP which is conduction cooled not water cooled. A big ass TEC would do the job.

EDIT: Look at the datasheet in the link, FAP800 it is!
*If you want any 3D models for google sketchup I made models of the CCP diodes as well as the fap diodes*

You're going to need a fair bit of *oomph* to get this to full power. 53A at 2.2V with good regulation. A few members here have used a rectified and rewound MOT with a variac to get the right voltage and supply enough current.

Cooling must be taken into consideration as well, this set up will make a fair amount of heat!
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