IR / Visible ZnSe windows

Every fusor and fusion system seems to need a vacuum. This area is for detailed discussion of vacuum systems, materials, gauging, etc. related to fusor or fusion research.
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John Futter
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IR / Visible ZnSe windows

Post by John Futter » Wed Sep 16, 2020 1:36 am

New ZnSe windows arrived from China.
I bought 10 of these from china custom made for approx $2000 75mm dia 5mm thick they are stunning
IMG_20200916_133006_228.jpg

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Dennis P Brown
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Re: IR / Visible ZnSe windows

Post by Dennis P Brown » Wed Sep 16, 2020 11:27 am

Obivously good for the infrared - so I assume that is their purpose? And why so many?

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Richard Hull
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Re: IR / Visible ZnSe windows

Post by Richard Hull » Wed Sep 16, 2020 11:34 am

Planning on a gang of IR work? At 2 kilobucks, your are a serious guy.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

John Futter
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Re: IR / Visible ZnSe windows

Post by John Futter » Wed Sep 16, 2020 7:34 pm

I'm wanting to see an ion beam target with a FLIR camera and see how hot it is getting during implantation and also use it to look at a heated stage in a sputter system

and why so many
the sputter system will tend to coat the window so I got a few spares

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Dennis P Brown
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Re: IR / Visible ZnSe windows

Post by Dennis P Brown » Wed Sep 16, 2020 10:20 pm

Don't know the wavelength your using but if it is above 4 microns, a silicon wafer could be used to protect the ZnS window. Three inch diameter silicon wafers are rather cheap - or use to be; don't know if still avialable but might be worth looking in to if that wavelength is usable.

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Dennis P Brown
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Re: IR / Visible ZnSe windows

Post by Dennis P Brown » Thu Sep 17, 2020 2:19 pm

Wow, looked up the transmission of silicon wafers and it is closer to one micron! While its just 60% over 1.4 microns (high index) it certainly would be a cheap protection plate.

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Richard Hull
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Re: IR / Visible ZnSe windows

Post by Richard Hull » Thu Sep 17, 2020 4:29 pm

I once paid $100 for a giant (12" aperture) IR lens at a hamfest. It was undoubtedly some sort of military surplus IR lensing system. The lens weighed over 32 lbs! It had a totally opaque front element of pure elemental germanium. I kept it for about 3 years and sold it to a much more astute person at a hamfest for his first offer of $300. I now realize that there was about $8000 worth of germanium contained in that lens. Oh well....

I attach the pass band graph of a 5mm thick disk of pure germanium. Fantastic!

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Germanium_Uncoated_Window_Transmission_Visible_780.gif
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

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