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Old 07-14-2008, 05:34 PM #1
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Default Education Time Tellurium

http://www.youtube.com/watch?v=5ChFbVu4Mpk&fmt=18


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Old 07-14-2008, 05:43 PM #2
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Default Re: Education Time Tellurium

Cool :P though he said infra red lasers are like heat rays, but it really depends on the wavelength
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Old 07-14-2008, 06:38 PM #3
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Default Re: Education Time Neodymium

http://www.youtube.com/watch?v=PBbl-3_R3mk&amp;fmt=18

LOL is this guy fried or what?
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Old 07-14-2008, 07:49 PM #4
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Default Re: Education Time Germanium

http://www.youtube.com/watch?v=osrKWVknkgs&amp;fmt=18
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Old 07-14-2008, 08:38 PM #5
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Default Re: Education Time Tellurium

We dont need to explain how green lasers work now !
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Old 07-15-2008, 12:46 AM #6
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Default Re: Education Time Tellurium

the germanium one is awesome! i didnt know it was &quot;invisible&quot; to IR!
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Old 07-15-2008, 02:02 AM #7
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Default Re: Education Time Tellurium

Hey I was an optician in the 80's and we made IR lenses mostly (at Exotic Materials) . The truth is Germanium when totally pure is not perfectly transparent to IR, it needs a &quot;dopant' a very small amount of actinium or arsenic is added in order to get the 99% or so transparency (only once coated for IR anti-reflection) the coatings were also interesting, one kind used multi-layers of elements including thorium. I ran a &quot;Hard Carbon Coating machine, which used plasma and cyclohexane, (a carbon source), to make thin layer man made diamond on the germanium so a wiper with sand after 500 revolutions would not mark, scratch or remove the diamond coat which looked like a very shinny black shoe polish surface. With Hard Carbon the lens or window of doped germanium would pass 99.5% of the IR from 900 to 1600nm these were used on the Apache helicopters' Pilot Night Vision System, (PNVS) and the Tactical Acquisition and Deployment System (TADS) ( Guided Missile system) on the outer most optical surfaces.
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Old 07-15-2008, 11:00 AM #8
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Default Re: Education Time Tellurium

Wow thats really cool, i never knew any of that.

For those that don't know cyclohexane is an fossil fuel or hydrocarbon ( made up of hydrogen and carbon ), cyclohexane has the formula C[sub]6[/sub]H[sub]12[/sub] and burns/evaporates more readily than gasoline which is octane C[sub]8[/sub]H[sub]18[/sub], the structure of cyclohexane is a ring, as with all other cycloalkanes.

there you go another chemistry lesson to go with the videos :P

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Old 07-15-2008, 02:27 PM #9
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Default Re: Education Time Tellurium

Quote:
Originally Posted by scopeguy20
Hey I was an optician in the 80's and we made IR lenses mostly (at Exotic Materials) . *The truth is Germanium when totally pure is not perfectly transparent to IR, it needs a &quot;dopant' *a very small amount of actinium or arsenic is added in order to get the 99% or so transparency (only once coated for IR anti-reflection) *the coatings were also interesting, one kind used multi-layers of elements including thorium. *I ran a &quot;Hard Carbon Coating machine, which used plasma and cyclohexane, (a carbon source), to make thin layer man made diamond on the germanium so a wiper with sand after 500 revolutions would not mark, scratch or remove the diamond coat which looked like a very shinny black shoe polish surface. *With Hard Carbon the lens or window of doped germanium would pass 99.5% of the IR from 900 to 1600nm these were used on the Apache helicopters' Pilot Night Vision System, (PNVS) and the Tactical Acquisition and Deployment System (TADS) ( Guided Missile system) on the outer most optical surfaces.

MMMmmm, PECVD. Do you happen to know more about the tool? Inductively coupled plasma? My old lab has a PECVD system for diamond-like carbon as well, it mostly just used methane, nothing as fancy as cyclohexane. Word up to all the other thin film engineers. I'm partial to sputtering, myself, but I'm doing some evaporation nowadays too.
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Old 07-15-2008, 06:01 PM #10
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Default Re: Education Time Tellurium

I do know the the &quot;vapor&quot; (carbon nuclei) is driven like a particle accelerator and hits the surface with enough energy to fuse together to get the cubic crystal structure. If the turbo molecular pump is not keeping the plasma at a high enough vacuum, then more of the component micro-crystals in the film, will be hexagonal, which of course is graphite and then the coating would remove with plain water. Also, I was told other carbon sources would work in the Leybold-Heraus coating machine. This unit also, had such high voltage I forget the number.
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Rigel SOLD! 3-4 mW I Love it PGL III 593.5nm doing >20 mW! SOLD!
Several Green lasers, EVO PRO Peak ~160 mW & Spyder I Peak 295 mW are my new green favorites!
LG Aquarius -10 & Viasho 473 nm peak ~29 mW WL S3 >60 mW peak 112mW SOLD!
Awesome rhd 451nm 2.1 W SOLD! & 445 >2W by DTR! , Yobresal 1.2W Cree & pen 445 w/ star-cap doing 750 mW!! 500mW 445nm Dorcy Jr. Thanks to Flaminpyro!
Awesome Osram 450nm pocket mini from DTR does about 750mW!

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Old 07-16-2008, 02:48 AM #11
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Default Re: Education Time Tellurium

The crystal he was holding in the tellurium video is a Cadmium Telluride OPO element.

Btw Oh check out the Cesium video... I got a vial of it TWICE that size, a quarter kilogram of it.
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Old 07-16-2008, 05:44 AM #12
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Default Re: Education Time Tellurium

Quote:
Originally Posted by heruursciences
The crystal he was holding in the tellurium video is a Cadmium Telluride OPO element.

Btw Oh check out the Cesium video... I got a vial of it TWICE that size, a quarter kilogram of it. *
the cesium to cool id love to have some of that
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Old 07-16-2008, 10:25 AM #13
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Default Re: Education Time Tellurium

1/4 Kg of Caesium thats a big explosion
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Old 07-17-2008, 01:38 AM #14
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Default Re: Education Time Tellurium

Here is the picture of the cesium for your drooling enjoyment.

It is 5N 99.999+ purity and came from a company that built cesium beam time standards. It would be a terrible waste to toss it in water, especially since it's probably worth it's weight in gold... literally...
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Old 07-17-2008, 09:50 AM #15
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Default Re: Education Time Tellurium

That will be worth well over $100 probably a lot more
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405nm | Banggood LT-850 | "5mW" | Review Unit | Review WIP
445nm | Sanwu Laser Pocket Series | 400mW Metered
445nm | NDB7242E Pen Build | 60mW Metered | >>Build Thread<<
450nm | LaserPointerStore - Thor H2 | 1W(?) | Review Unit | >>Review<<
488nm | Spectra Physics 163 Argon | ~30mW Metered
515nm | PL515 Pen Build | 50mW Metered | >>Build Thread<<
520nm | Laserlands 520 | 5mW | Review Unit | 3mW metered | >>Review<<
532nm | Gearbest 303 Pointer | 50mW Metered
532nm | Gearbest JD-850 Pointer | 30mW Metered (I think, need to re-test).
633nm | HeNe | 6mW
633nm | Spectra Physics 155 HeNe | <1mW >>Thread<<
650nm | Sanwu Laser Pocket Series | 200mW Metered
808nm | Melles Griot 532nm Lab Unit | No Crystals >10W | X2



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