Old 07-07-2016, 05:43 AM #17
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Default Re: 4W C-mount 808nm IR laser

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Originally Posted by Pman View Post
I understand Ice. I thought I had taken a couple pics of what I did but apparently not. I'll have to see if there's anything else I can show with it.

The top silver piece doesn't do anything and can be popped out as it has a gasket that keeps it in place. The ringed piece has the lens attached and can turn to focus although like I saI'd it doesn't really focus much other than really close. The c-mount/ heat-sink assembly is pressed into the host and there's a plastic hollow spacer where the wires go down the middle to the contact board and it's wired case -. The hollow tube is cut the correct length to keep the right tension against the contact board so it stays hard against the lip inside the host and won't lose connection when the batteries are installed. Hope you understand.
Thanks for reply and explanation.

Ok so let me run this back. Obviously focus adapter isn't used. The head (with the lens threading) isn't used either (at least not meaningfully). The c_mount assembly is pressed into the cavity behind the head/above the battery.

A sleeve is cut to mount through the center of unit from the mount to the contact board that is used for the battery contact + end centered and the case is wired to the - of the contact board.

Let me know if that is correct please. Also, did you need to adjust the sizing on the ebay c-mount to press in?

Thanks for explanation. I've got 18 C-Mount 2W 808s I'm always looking for ideas on what to do with them. An IR Kryton would be a fun add on to my other ones.

Nice build


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Old 07-07-2016, 10:04 PM #18
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Default Re: 4W C-mount 808nm IR laser

I honestly cant remember if I had to trim anything to get the assembly to fit but if I did it was done using only hand tools which includes stuff like my dremel and drills. I have no machine tools like a machine shop would have. I'll take a look at it and see if I can tell without taking it apart. I built it over a bunch of time and kind of gave up on taking pics as I actually hadn't intended to show it.

Ok, just looked and the top ribbed section that unscews. The c-mount assembly is Arctic silvered to the back side of it so that section makes it part of the heat sink and then the whole thing when screwed into the host now also makes the host the heat sink.
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Old 07-08-2016, 05:31 AM #19
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Default Re: 4W C-mount 808nm IR laser

Quote:
Originally Posted by Pman View Post
I honestly cant remember if I had to trim anything to get the assembly to fit but if I did it was done using only hand tools which includes stuff like my dremel and drills. I have no machine tools like a machine shop would have. I'll take a look at it and see if I can tell without taking it apart. I built it over a bunch of time and kind of gave up on taking pics as I actually hadn't intended to show it.

Ok, just looked and the top ribbed section that unscews. The c-mount assembly is Arctic silvered to the back side of it so that section makes it part of the heat sink and then the whole thing when screwed into the host now also makes the host the heat sink.
Thanks, for extra info.

I think I'll grab a couple of those mounts, seemed like the worked well for you.
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Old 08-22-2016, 11:00 AM #20
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Default Re: 4W C-mount 808nm IR laser

I want to build an IR laser someday too, been thinking about it for two years now, already have the 808nm C-Mount with FAC lens laser diode too but a bit higher power. The thing which is holding me back is the beam expander I want to put on it, has to be big for a decent divergence due to the 400um wide emitter on mine, much larger than many IR laser diodes. Another thing holding me back is finding a machinist who will build a host to hold the large 6+ inch diameter PCX lens I want to put on it. Mine couldn't be used for burning, not with that much expansion, but would make one heck of a nightlight for night vision etc, if the focus adjustable, the light could make a tight spot or a wide beam output. Not posting to discuss that, but wanted to let you know my interest in this kind of build too and share some of my findings to help others who might also be interested in IR.

If you have a camera which can pick up the beam at night I'd love to see what the beam looks like going out into a dark sky. I bought a cheap camera on ebay and took out the IR filter to be able to do so with one of my other IR projects, you can see it scan by in my avatar as a pink-purplish looking beam color. That beam was produced by a Coherent FA800 laser diode module with a small 20mm diameter SMA coupled PCX collimator on it, the divergence was terrible, but still tight enough to make a decent beam into the night sky, as viewed with my modified camera. That wasn't a pointer though, had a 2 VDC 25 AH Gates Clyclon battery hooked directly to the diode using just a couple of inches of 6 gauge copper wire hanging off the back, well, holding the battery with one hand, the FAP800 with another. The voltage from the single cell lead acid battery was low enough that with a large enough heat sink the diode would not overcurrent, so it didn't have a driver on it for that test. Even after 10 minutes of run time the diode did not go into current runaway because the battery was beginning to be drained by then and loosing power due to voltage sag. Later took everything apart though, need a host built for it using a larger lens.

If someone is interested in building a C-Mount 850nm laser diode pointer, Junktronix on ebay is selling 1.5 watt C-Mount diodes for under 20 dollars each: http://www.ebay.com/itm/850nm-C-Moun...-/252501958250

For burning, I'd get a much higher power one unless using a fairly large diameter PCX lens at least 2 inches diameter to allow the beam to be focused down to a tight spot several feet away, do that and this 1.5 watt IR diode will burn well enough, especially black colored objects. Easiest way to know the diameter and focal length needed is to put a spot on a wall without a lens, see how wide it is at different distances from the wall (using a camera). Then you can know the approximate PCX lens diameter needed at what focal length for infinity focus, then the lens can be moved in or out to widen the beam, or focus to a small spot. Get a lens at least 20% larger diameter than you think you need to allow room for error as well as to keep from using the whole diameter of the lens, you can do that, but having the beam diameter 20 percent smaller than the lens used to collimate it is a good rule of thumb to use. To reduce or possibly eliminate astigmatism wing artifacts I like to use PCX lenses twice as large as the beam diameter.
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Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

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Last edited by Alaskan; 08-22-2016 at 11:47 AM.
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