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ArcticMyst Security by Avery

The He-Ne breakdown

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Apr 26, 2010
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I was bored... So I made an educational video describing the breakdown of a basic 632.8nm HeNe.

Rough in the beginning, but I get there around a couple minutes in. Enjoy! Post any questions you may have :)

Also, website is available here as an IP. Still waiting on the ISP's coffee to kick in...

 
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benmwv

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Awesome! Very informative.

Seems like a tunable hene is something a hobbyist could build if you had a tube with brewsters on each end. Is that hard to find?

Now i'm off to read your site ;)
 
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Only one brewster window is needed.

Perhaps I should mention this isn't something you can do overnight. You're going to need a 1B tube, a mounting rail for the tube, and a mirror mount that will adjust the mirrors. Getting it perfectly inline is not a game ;)
 
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Great stuff. Was just explaining this myself about an hour ago to a co-worker. Very fast and simple terms, and very informative. Thanks for the video bloom.
 

benmwv

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I was thinking both ends so you can use different OCs. Or can you get one with an OC that covers all hene lines?
 
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Well if it's a brewster tube, then there's no point in building it with a narrow OC, otherwise the brewster window is pointless because you're just adjusting it to get something you could have already bought, without it being specially made.

Chances are very likely that the OC is already broadband.

Plus, lining up 2 mirrors? It's not like you have a beam to try to line up. There won't be a beam until you line up the mirrors ;)

All lines is improbable. For a 543nm you need a slightly altered gas mixture. The REO LSTP uses a process that I have now forgotten. I will find it though. Not really set in stone, only theorized. Anyway, at best you can get lines from 594 and up.

That being said, my REO 61nm is the only tube Sam has heard of that lases yellow from a non yellow tube. So best of luck, 612 is easy in the grand scheme of things. 604 is luck, 635nm and 640nm are close to guaranteed, beyond that it's luck again.
 
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