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Old 05-01-2009, 01:28 AM #1
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Default Grow your own crystals!


http://www.milankarakas.org/pub/KDP/HomegrownKDP.html

Edited: new lpf forum software changed my "astonished" smiley to an "embarrassed" smiley for some reason.


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Old 05-01-2009, 09:08 AM #2
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Default Re: Grow your own crystals!

link not working
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Old 05-01-2009, 12:25 PM #3
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Default Re: Grow your own crystals!

Works for me!

Pretty damn cool, I wouldn't have thought anything home made would have been pure and good enough for pumping

Nice work whoever did that
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Old 05-01-2009, 12:25 PM #4
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Default Re: Grow your own crystals!

Excellent find, pseudolobster!

Link works fine for me!

(Although I would be cautious about viewing any of the linked PDF files that are hosted on unknown Eastern European web sites, particularly in light of the warning c0ldshadow recently posted!)
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Old 05-01-2009, 05:35 PM #5
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Default Re: Grow your own crystals!

Really nice find pseudolobster!

It would be very hard to replicate properly though... You need extremely stable conditions and a totally clean environment.

If anyone has access to a cleanroom, maybe they can start making crystals on the side.
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Old 05-01-2009, 05:43 PM #6
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Default Re: Grow your own crystals!

Very cool article. I'm amazed he was able to get green photons from a home-grown, uncut and uncoated crystal.
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Old 05-01-2009, 07:49 PM #7
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Default Re: Grow your own crystals!

hell yeah. can it be that the diy laser scene makes more progress this year than ever bevore? laser tv beamers, ubercheap gb's, special ar lenses, cristal growing...
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Old 05-01-2009, 08:33 PM #8
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Default Re: Grow your own crystals!

PDF is checked. *Virus free boys and girls! *

Have at it!

Now given that, I have the same chemical at home! I just may have to try and grow some crystals...just for shits and giggles.

Now, does it require a special laser to excite the crystals? Certain wavelength, power, anything?

Love to just make crystals that have a florescence under laser excitement. Anyone knowledgeable enough here that can help break this down for the laymen....or someone who half-ways understands this article?
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Old 05-01-2009, 09:01 PM #9
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Default Re: Grow your own crystals!

So, basically you need just KH2PO4 (CAS 7778-77-0)
I can get this from our biggest Chem supplier for as low as 20€ per kg

And he says industry adds EDTA (60-00-4) and KCl (7447-40-7) which i can get too

So when i make my giant order (to supply my Provigil synthesis project ) i can maybe put this in and give it a shot...



btw: can Nd:YAG can be pumped with IR Cree's ?
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Old 05-01-2009, 09:09 PM #10
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Default Re: Grow your own crystals!

iR is iR, i dont see why it woulnt work.


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Old 05-01-2009, 09:29 PM #11
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Default Re: Grow your own crystals!

I would probably try this, - as I already used to grow crystals of basic compounds and I've made some realy clear crystals - but The only problem is I don't have the compound he talks about. I'll see if I can find some.




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Old 05-02-2009, 07:37 PM #12
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Default Re: Grow your own crystals!

link is dead to me
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Old 05-02-2009, 08:19 PM #13
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Default Re: Grow your own crystals!

worx fine for me
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Old 05-06-2009, 06:30 AM #14
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Cool

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Originally Posted by bschott View Post
Now, does it require a special laser to excite the crystals? Certain wavelength, power, anything?

Love to just make crystals that have a florescence under laser excitement. Anyone knowledgeable enough here that can help break this down for the laymen....or someone who half-ways understands this article?
Well. From what I know, it is related to the optical properties of the crystal. Essentially the crystal is "frequency doubling" (or wavelength splitting). So you put in 1064nm (wavelength) of infrared light, and the crystal splits the wavelength to 532nm and outputs visible green light.

Here are the pics illustrating this, from the link above:



Looks like the crystal has to be at a 42 degree angle.
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Old 05-06-2009, 11:50 PM #15
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Thats awesome, ill try this if i have some time.
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Old 05-08-2009, 12:24 AM #16
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Default

It is very cool... but one thing to keep in mind: To do this, you will need a pulsed, high powered pump laser. None of this is likely to work using a CW 1064 at any power level.

The doubling process is nonlinear, and with these crystals probably very inefficient. The only way to get enough power to make it happen without blasting the crystal to bits is pulsed operating with short, high intensity pump pulses.

I have seen this demonstrated in a similar setup with uncoated crystals just in front of the pump aperture producing faint green light, but it's a long shot to reproduce by any means.
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