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Old 12-01-2014, 02:26 AM #1
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Default Highest power through a S1 or G2 lens?

Hello,

Looking for information regarding the highest power which is reasonable to push through a S1 or G2 glass lens from IR through 405nm, what have you seen as the upper amount of power anyone has pushed through one without problems in any nm wavelength IR through visible spectrum? I am particularly interested in 808nm for one of these lenses but at many watts.


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Old 12-01-2014, 02:48 AM #2
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Default Re: Highest power through a S1 or G2 lens?

I think the G lens' are broadband coated for the visible spectrum, they may not perform well into the IR spectrum.
If you look on ebay you can find some cheap lens' specifically coated for 808nm.
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Old 12-01-2014, 02:52 AM #3
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Default Re: Highest power through a S1 or G2 lens?

I bought some MODC's and only have the S1 and G2 lenses to work with, I will see if I can find one which will fit into that lens holder coated for 808nm, but even then I have no idea if my high power C-mount IR diode will be too much power with it or not, for the size. I don't even want to say how much power, it makes people nervous to put it in a pointer but it is far less than my FAP laser diode array @50 I was considering to use earlier. If I can't make this lower power C-mount work, I will have to use the heavy FAP808nm unit I already have a lens for with a 20X beam expander to reduce the divergence and back the power off with a CC regulator. Not sure if this will work out or not, so far I've found that everyone reports nothing but trouble trying to tame the divergence of a FAP laser and thus my preference to use the C-Mount 400um aperture 808nm diode I have.

If I could get an idea of the max power at any wavelength through one of these small lenses, it would be helpful to me.
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Last edited by Alaskan; 12-01-2014 at 07:13 AM. Reason: Keep adding more info in the hopes of suggestions.
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Old 12-01-2014, 06:04 PM #4
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Default Re: Highest power through a S1 or G2 lens?

Wait stop! Don't use the standard G2-405 lens for 808nm at that power. Those shouldn't be used for a high power laser beyond 600nm. There is a second G2 lens, the 650-G2 with the AR Coating: B Coating, <0.5% reflectivity from 620nm to 1080nm, per surface. This should be OK for 808nm at that power. You can buy the G lenses here:
Creative Technology Lasers - Your source for diode lasers and laser modules at green, red and other wavelengths.
and the lens you want is on this page:
Creative Technology - 650-G-2 Lens Page Creative Technology - Your source for diode lasers and laser modules at green, red and other wavelengths.
If you need a lens holder for it you can get one from DTR here:
https://sites.google.com/site/dtrlpf/home/glass-lenses

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Old 12-01-2014, 06:34 PM #5
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Default Re: Highest power through a S1 or G2 lens?

I did find some coated for 808nm and 980nm , plan to try both for 1.3W 808nm and 7W 940nm respectively .

Ill get links when I find em .
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Old 12-02-2014, 03:34 AM #6
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Default Re: Highest power through a S1 or G2 lens?

Thank you very much, I ordered one, the 650-G2, let's see how hot I can get this baby
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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.

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