Measure beam profiles?

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Originally Posted by Daedronus

I use this for my IR beams:
http://www.youtube.com/watch?v=KIizzSHFHEQ

On a unaligned YAG (but still aligned enough to get a small output) it allows me to see exactly winch way I need to turn the mirrors.

Works really nice, but it's not exactly cheap.

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that's cool! it makes me want to make a reverse lumia projector. ;) is it specific for 1064 or will other flavors of IR work?

Not really 1064 specific, in that video it's 650nm, but filtered by glasses to make it "invisible" to the camera.

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Originally Posted by Daedronus

Not really 1064 specific, in that video it's 650nm, but filtered by glasses to make it "invisible" to the camera.

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is the glow material anything other than just standard issue zinc sulfide? i have a 5'x5' section of my garage painted in glow paint for 405nm experiments, maybe i should pick up some IR diodes and do some experiments.

I have no idea what is on the plate, there are two separate areas, one that "lags" and one a lot more responsive. The laggy one is meant for pulsed lasers.

I think that to some degree any fluorescent material will show this quenching effect when illuminated by IR. You will have to try and see.

I tried with some fluorescent markers (green) and it didn't work well (at all), on the other hand some glow in the dark stickers did.

There are about 6 phosphors that do it, Its in storage, and would be a week before I can get at it, but I have a Copy of the Phosphor Synthesis handbook, so if anyone is really interested in making some, its doable. Well, doable if you have a lab furnace or similar at 850C.

They are known as IR Quench phosphors, Its a little bit off from the standard cheap ZnS chemistry, has a bit different trace of dopant.


Here ya go, one formulation.

http://www.google.com/patents?id=kXp...age&q=&f=false


Steve

I might be interested in some "simple recipes" if you might get some easily... I'm just wondering if an induction furnace would do, and if I will find a clay recipient which would whitstand such temperatures

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Originally Posted by shrad

I might be interested in some "simple recipes" if you might get some easily... I'm just wondering if an induction furnace would do, and if I will find a clay recipient which would whitstand such temperatures

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graphite is cheap and readily available.

Steve

thanks! I never thought about graphite, I'll have a look at some suppliers to find what cost a graphite rod I could machine to get a pot

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Originally Posted by shrad

thanks! I never thought about graphite, I'll have a look at some suppliers to find what cost a graphite rod I could machine to get a pot

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http://www.waleapparatus.com/ They are cheap, I have a few sitting in the other room next to my kiln. Damn I need to get my glass studio up and running again (it is in a box like Steve's book).

-Adam

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Originally Posted by Daedronus

I have no idea what is on the plate, there are two separate areas, one that "lags" and one a lot more responsive. The laggy one is meant for pulsed lasers.

I think that to some degree any fluorescent material will show this quenching effect when illuminated by IR. You will have to try and see.

I tried with some fluorescent markers (green) and it didn't work well (at all), on the other hand some glow in the dark stickers did.

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i need a better IR source for testing than just aiming my co2 laser at the wall... tempting as it is, my kitchen is on the other side.