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Old 11-08-2015, 03:23 AM #1
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Default Coherent 808nm/IR Fiber Array Package Beam Shot (Movie added to thread).

Finally got around to expanding & collimating the output of my Coherent FAP800 laser module to 2 inches beam diameter, sure makes the beam behave much better without so much spreading:

Below, photo's taken prior to expansion with a 12mm diameter collimator lens using approx 15-20% of output aperture. As you can see, the divergence is terribly wide compared to what we are used to with our laser pointers, far worse than even a multimode diode:



The above beams were through this 12mm aperture PCX lens which was directly coupled to the fiber output connector of the FAP800:



Beam shot after expansion from approximately 1 mm (fiber aperture 810 μm) to 50mm with resulting reduced divergence. To achieve the expansion and collimation I used a 12mm diameter -15mm focal length plano-concave lens inside the same lens holder shown above (removing the PCX lens from it first), followed by a large diameter plano-convex lens a few inches away, see the result below.



I was running low power just long enough to snap a couple of shots when I took this photo from a well guarded fixed point. Please excuse the grainy look, the camera is a very cheap digital camera with the IR filter removed and auto focus very confused. Anyone care to estimate the new reduced full angle mRad to check my thinking of what it might now be with a 2" diameter beam? ~5 mRad? It doesn't appear to be that wide of a divergence to me, I've seen wider with multimode laser diodes using a 6mm diameter collimation lens. Perhaps the spreading of the beam on the far end just isn't being picked up by the camera due to being less sensitive to IR giving the illusion the divergence is much less than it really is.

Here are two photo's of the output when at low power into a 12mm collimator, the beam spreads from about 1mm to 100mm at about 15 feet or 4.6 meters, using the online calculator at Laser Optics Calculators the divergence is about 21 mRad with this 12mm diameter lens, although a much smaller beam diameter when first leaving the lens. The photo on top was taken when the current was set so low the laser diodes were barely lasing, thus able to use the camera to take a picture shooting straight into the lens. Regardless, I still wore my goggles and kept the camera between myself and the laser output at all times. When I put my camera lens face to face with the laser output, the IR light from the fiber bundle was viewed as a very tiny spot, probably about 1mm diameter but at the distance away from the lens this top photo was taken, the beam has spread quite a bit to appear much larger.


The bottom photo of the two shows the beam pattern at about 15 feet away and 4 inches wide.
My camera couldn't focus on the IR very well as close to the spot as I was, but this gives an idea.
For this photo the output was at very low power, otherwise the intensity would completely wash out any detail.

What a FAP800 looks like:

http://www.coherent.com/downloads/FA...nal.pdf#page=2



More on this device here: Coherent FAP800 Diode Array Divergence Question


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Last edited by Alaskan; 11-11-2015 at 12:28 AM. Reason: Took another photo, updated post with it. Added a lot more info.
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Old 11-08-2015, 09:22 AM #2
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Default Re: Coherent FAP800 Expanded 808nm Beam Shot

That's not bad, the fiber combining/grouping of 19 emitters looks good.

I knew fiber had possibilities, it's nice to see them doing it.
rep owed LOL

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Old 11-08-2015, 06:07 PM #3
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Default Re: Coherent FAP800 Expanded 808nm IR Beam Shot

Thanks, I added more photo's and explanation to the above post. I know this isn't recommended, but I'm running the FAP800 off of a Enersys Cyclon 2.0 VDC 25 AH single cell lead acid battery without a driver. I've been using this laser without a constant current driver on my bench for these tests while monitoring the current draw and so far, it isn't pulling more current when it warms up but I use a fairly large heat sink, maybe that's why. I've done tests up to 20 minutes long with my highest power 40-50 watt FAP and it isn't getting very hot at all, warm yes, hot not. I have a dozen of these FAP's at various power ratings so if I kill it, have others to be more careful with.

Battery: Hawker Cyclon SINGLE CELL 2V-25AH BC Cell



This battery appears to be ideally suited for the FAP800 without a driver, if you buy a big enough one with a large capacity, that is.
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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"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.

Each of these three rabbit holes go deep, ending up in the same place.

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Last edited by Alaskan; 11-09-2015 at 04:03 AM. Reason: added photo
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Old 11-09-2015, 12:52 AM #4
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Default Re: Coherent 808nm/IR Fiber Array Package Beam Shot

Please excuse the double post but I wanted to add a movie for all of you folk who like to see things burn:

http://s853.photobucket.com/user/Las...tml?sort=3&o=0



I was running off of a DC power supply when this video was shot pulling 40 amps at 2 VDC which for this FAP is about 40 watts output. I tried to upload the video to YouTube, but it kept rejecting it for some reason. I could run it off of the battery for this demonstration to produce the same results but then I'd have to recharge it again which I am too lazy to do tonight. On battery the laser will put out full power for about 10-15 minutes before starting to reduce output to about half after 15 minutes. The higher power 40 watt FAP I used for this video recording really pulls some current. I'd like to make a portable battery operated unit out of this with a large 6 inch beam expander for some experiments I'd like to conduct. Once it is expanded, it won't burn, but still an eye hazard.
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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"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.

Each of these three rabbit holes go deep, ending up in the same place.

Useless troll fighting.

Last edited by Alaskan; 11-09-2015 at 07:20 PM. Reason: Adjusted run time statement
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Old 11-09-2015, 01:36 AM #5
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Default Re: Coherent 808nm/IR Fiber Array Package Beam Shot

Awesome to see you learning so much about these. Thanks for sharing. This is what these forums were like years ago, not filled with a bunch of useless threads about Chinese garbage and newbies asking redundant questions.

I would definitely have to recommend getting a proper power supply or driver. I would be surprised if that battery could supply enough current to kill the array, but even so..
Maybe I missed it, but what's the intended use for these?
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Old 11-09-2015, 01:43 AM #6
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Default Re: Coherent 808nm/IR Fiber Array Package Beam Shot (Movie added to thread).

The reason I originally came to the forum was due to an interest in IR lasers for mountain top to mountain top data link communications, just a hobby. At some point, I'd like to try to modulate the beam with data and try to get that working.

I'm going to keep using this FAP800 with a battery and without a constant current regulator to see if it dies from the abuse, but even with my power supply current limit turned up far higher than the unit is pulling, I don't see the current creeping up at all as the laser warms. With the battery, it drains so fast the current starts dropping off before the diodes can get so hot as to go into a thermal current runaway situation, if it can happen, I don't think it will using the battery due to the limited amount of time it can run on one.
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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"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.

Each of these three rabbit holes go deep, ending up in the same place.

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Old 11-09-2015, 03:39 AM #7
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Default Re: Coherent 808nm/IR Fiber Array Package Beam Shot (Movie added to thread).

It's amazing what they can do with some real power, this video is C02 but there are some big 808's stacks that I would like to work with.



If you want to transmit information then you want bandwidth, and I wonder about atmospheric conditions, I wonder what wavelength the military JDAM uses and if you can get surplus, it works in awful conditions.

Maybe surplus range finding lasers, but I also think some surgical lasers are around 250-300nm and that would be good for a data link because you would get more bandwidth, but that's probably not going to be the main issue, atmospheric moisture will likely be the biggest obstacle.
Lasers I think grew out of masers and that's another consideration, anything in the visible or near ir has eye safety concerns so as always proceed with your usual excellent level of caution my friend.

LOL aren't you an amateur radio guy? You work on microwave communications... I'm preaching to the choir here huh?

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Old 11-09-2015, 04:15 PM #8
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Default Re: Coherent 808nm/IR Fiber Array Package Beam Shot (Movie added to thread).

Quote:
Originally Posted by crazyspaz View Post
I would be surprised if that battery could supply enough current to kill the array
SLA cells can supply peak currents of well over 10C, which is in the range of 300A for this particular cell. Given the similarity of the cell voltage to the diode's forward voltage and the low internal resistance of a SLA, I'd say the power leads themselves act as the primary ballast resistance here.
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Old 11-09-2015, 04:52 PM #9
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Default Re: Coherent 808nm/IR Fiber Array Package Beam Shot (Movie added to thread).

Yea, I completely read over that comment without much thought, the battery can supply a tremendous amount of current, the primary reason I bought it is because it can do so without the voltage dipping much due to a very low internal resistance together with the ability to have a decent amount of run time, for my needs. Also, these batteries can last a long time, over a decade, some last 20 years, but their life depends on how deeply they are discharged and how many times. At least 500 discharge and charge cycles if discharged to no more than 50% percent each time, the way I use the battery with this FAP800 I don't let them get below 1.8 volts of discharge, but they can be discharged to 1.5 volts which is too low of a voltage for the array to put out any power (well, maybe a tiny amount at the lase threshold, but not much), that's why they are well matched.

My power leads are 2 AWG copper and 4 feet long (yes, I know, another potential issue with wires that long due to the back voltage a collapsing magnetic field can produce), but even at that length and a total loop resistance of .003 Ohms, the wire doesn't have enough resistance to ballast the amount of current the diode array could pull if it were to go into a thermal runaway situation. However, to do that, my understanding is they have to get hot first & I don't let them get that hot with the big heat sink I am using coupled with the limited run time.

Edit: Here's a current draw vs time for the Cyclon cells, I highlighted the type of cell I am using at the current draw the FAP800 I used in the video can pull if driven to max output, although 1.67 volts is too low for this laser, 1.8 VDC causes the laser to go down to 15 watts instead of the full 40+. With one battery, the run time at high power is closer to 10 minutes, with reduced power to about 15 watts after 15 minutes.

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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"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.

Each of these three rabbit holes go deep, ending up in the same place.

Useless troll fighting.

Last edited by Alaskan; 11-09-2015 at 07:09 PM. Reason: Inserted statement in first parens.
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Old 11-28-2015, 04:31 AM #10
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Default Re: Coherent 808nm/IR Fiber Array Package Beam Shot (Movie added to thread).

I use a MPJA 15950PS for my FAP. It is 0-30 VDC @ 0 - 20 Amps.
CC or CV output. Digital readout.
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Old 11-28-2015, 04:43 AM #11
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Default Re: Coherent 808nm/IR Fiber Array Package Beam Shot (Movie added to thread).

Not wanting to get off topic, but MPJA is very high on their prices.
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Old 11-28-2015, 07:58 AM #12
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Default Re: Coherent 808nm/IR Fiber Array Package Beam Shot (Movie added to thread).

Another burning video using a 40W output FAP800, no lens, just the fiber output:

http://vid853.photobucket.com/albums...t/IMG_4570.mp4

Burning with the lens:

http://vid853.photobucket.com/albums...t/IMG_4568.mp4

I took these videos for Hemlock Mike so he can compare how his FAP is behaving to mine, with and without a lens attached.
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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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Last edited by Alaskan; 11-29-2015 at 01:21 AM. Reason: added 2nd vid.
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Old 11-30-2015, 02:01 AM #13
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Default Re: Coherent 808nm/IR Fiber Array Package Beam Shot (Movie added to thread).

Quote:
Originally Posted by Cyparagon View Post
SLA cells can supply peak currents of well over 10C, which is in the range of 300A for this particular cell. Given the similarity of the cell voltage to the diode's forward voltage and the low internal resistance of a SLA, I'd say the power leads themselves act as the primary ballast resistance here.

I have 2 8 amp 12 volt SLAs and a old battery draw tester.( a sears engine analyzer)

They pushed passed the 100 amp mark by a good bit.


when i had them hooked up as 24 volts one time they literally vaporized a tiny piece of aluminium.

Don't under estimate a good SLA
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Old 11-30-2015, 02:55 AM #14
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Default Re: Coherent 808nm/IR Fiber Array Package Beam Shot (Movie added to thread).

That's very cool when you conceder that is 19 emitters bundled by fibers.

It makes me wonder how tiny of a fiber we could use to bundle 7, 13, 19 or more in a circle of the 405nm diodes, the beam quality and reach could be impressive, especially after it gets run through a telescope for beam quality or an expander for maximum reach.

This could prove a lot easier and more packagable than knife edging.

Now think about the tiny emitter 520 single mode diodes, I see real possibility here when the new diodes come out and the old ones become inexpensive surplus.

LOL The mental image of a big backpack and a garden hose size fiber bundle looping around to my hand wand, the power of a few hundred diodes turning fallen leaves to ash in a 1/100 of a second pulse.

p.s. Grr, I must spread some rep, I keep spreading it, I appreciate your sharing, I owe you 1
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Old 12-05-2015, 06:27 AM #15
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Default Re: Coherent 808nm/IR Fiber Array Package Beam Shot (Movie added to thread).

I have a long fiber optics edge I could probably use to combine several diodes, the "edge" which is over 12 inches long of fibers about 1/4 inch thick sandwiched between two pieces of metal, the fibers all combine together into a circular output on the end of a 18 inch long tube. I'm considering this as a future project, shining a single beam on to any portion of the fiber edge puts out a nice green spot which can be collimated.
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To shorten my signature I have moved most of my laser related web links to this forum page, the second post in that thread shows most of my builds... Alaskan's Laser Links: http://laserpointerforums.com/f44/al...ml#post1449395


Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"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.

Each of these three rabbit holes go deep, ending up in the same place.

Useless troll fighting.
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Old 12-05-2015, 09:01 AM #16
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Default Re: Coherent 808nm/IR Fiber Array Package Beam Shot (Movie added to thread).

I was thinking of diodes like the 405's that is BDR-209 or 60SJ that have the small emitter size yet make good power and focus tight to enter the smallest possible fiber, maybe 7 diodes in a row heatsinked and fed into a row of fibers arranged in a circle at the other end, one in the center surrounded by 6.

Because 5.6mm or 3.8mm diodes can only physically fit just so close together with heatsinking, but with fiber you could have a tight little bundle, better than a lot of knife edging and optics, then lens the output, even if each fiber ended into a 1mm lens it would still be only a 3mm wide bundle, but I think we could do better with a single or pair of lens.
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