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Old 09-21-2008, 11:15 AM #1
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Default experiments with minerals and lasers!

i just read mauswiesel's experiment with ulexite and different lasers, very beautiful, be sure to have a look at it:
http://www.laserpointerforums.com/fo...num=1220656487

thinking about it, there are more things you can do with lasers and minerals!
mine all involve 405nm lasers and fluorescence:

-i separated topas and quartz, which sometimes, when in pieces without crystal-shape and not totally clear, look almost the same. topas fluorescences a light red, sometimes quite strong. quartz doesnt light at all.

-i tested that rock i was given decades ago, was told back then it was ruby. many many tiny red grains in a white matrix. on the laser, no fluorescence at all. doublechecked with my other rubys, they all light up red quite intensely. i bet they fluorescence in around 694nm.. ;-)

-i tested some small loose cut gems i got from ebay, with, you guessed it, my bluray. some light, some not. some time ago, but i think i could separate the stones in "probably natural" and "probably synthetic", since they packed one synthetic (and labeled as synthetic too) as free gift in my order

-i still am hunting for a fluorescent diamond. my sandgrain-sized crystal doesnt, the one in my moms ring doesnt. i think i need that 100mw bluray done soon! :-)

for all of that you definitely need googles to block the strong 405nm light, no way to see any fluorescence-"response" without! i got simple yellow sunglasses, which work well, and i see blue-"white" fluorescence through it. oh, i use only 10-15mw 405-output, else i would (and will) get proper laserprotection, please do so as well!

-i finally got a crystal of calcite, the double-refracting crystal. its quite clear. you put it on a piece of paper and see everything double. a line would look like two parallel lines. it works as it has different diffraction for different polarized light. vertically polarised light goes through, horizontally polarized light goes through in a small (really small) angle. what i heard, the regular polarizing-beamsplitter-cubes are made of this natural stuff too, no good cheap way to synthesize it or build a substitute. have to check that some day, cant really believe that..
oh, yea, wait, my experiment with that crystal: dissapointing. in theory, i would get two dots out of it, in small different angle. the distortion is so big that i dont have any dot at all.. :-)

so far my experiments. any you did?
and if someone must have pics, let me know, and i'll dig out that minerals-box again..

manuel


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Old 09-29-2008, 09:49 PM #2
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Default Re: experiments with minerals and lasers!

Quote:
Originally Posted by Krutz
-i finally got a crystal of calcite, the double-refracting crystal. its quite clear. you put it on a piece of paper and see everything double. a line would look like two parallel lines. it works as it has different diffraction for different polarized light. vertically polarised light goes through, horizontally polarized light goes through in a small (really small) angle. what i heard, the regular polarizing-beamsplitter-cubes are made of this natural stuff too, no good cheap way to synthesize it or build a substitute. have to check that some day, cant really believe that..
oh, yea, wait, my experiment with that crystal: dissapointing. in theory, i would get two dots out of it, in small different angle. the distortion is so big that i dont have any dot at all.. :-)
This birefringent crystal is used for waveplates in optical storage media puckups. It's part M on Sam's blu-ray dissection. Polarized beam splitters make use of a different phenomenon that every shiny material got: Brewster's angle reflection at precisely the cemented plane between the triangles.

And, try to rotate the laser around it's axis while shining it through the stone. I think this should modulate the brightness of the spots.
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405nm 166mW adjustable lab
405nm 130mW Xtreem
445nm 0.005W@1.7A semi-ghetto peltier-cooled labby-style handheld on batteries (BLL)
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...
Omitted are minor lasers, unworthy lasers, and bare diodes.

Forever wanted: ~505nm laser (and not just one of many lines!)
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Old 09-30-2008, 08:16 AM #3
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Default Re: experiments with minerals and lasers!

aaaaah, interesting! now i get it! i will have to &quot;research&quot; more on that stuff, have everything laying around somewhere!

manuel
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Old 09-30-2008, 05:09 PM #4
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Default Re: experiments with minerals and lasers!

i did pics of many different fluorescing things with 405nm, one &quot;natural&quot; and one with a filter:
http://www.laserpointerforums.com/fo...=1222101905/20
included topaz and ruby ;-)

manuel
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"Some say he eats Gallium Nitride for breakfast, others say that he can moonwalk and still defeat a Ferrari on the quarter mile......all we know is, he's called IgorT."
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Old 09-30-2008, 09:35 PM #5
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Default Re: experiments with minerals and lasers!

I have some calcite rock outside that I think phosphoresces (retains a short glow after being lit). It's a faint orange or something. I'd like to find out other minerals that'd do that though.
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Old 09-30-2008, 10:13 PM #6
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Default Re: experiments with minerals and lasers!

Quote:
Originally Posted by Bionic-Badger
I have some calcite rock outside that I think phosphoresces (retains a short glow after being lit). *It's a faint orange or something. *I'd like to find out other minerals that'd do that though.

Google &quot;long wave ultra violet&quot; (and any alterations like &quot;LWUV&quot AND fluorescence and/or fluorescent.

Peace,
dave
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