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4hv.org :: Forums :: Electromagnetic Radiation

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Old NeHe laser from an old FT-IR spectrofotometer

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LAN_403

Kilham

Sat May 01 2010, 12:51AM

Registered Member #2814 Joined: Wed Apr 21 2010, 12:28PM
Location: Scotland, UK
Posts: 24

I believe this tube was made by NEC in the late 70s, if so it's a .5-1mw tube.

Specs are:

Starting voltage 5.7Kv
Supply voltage 1300-1550v
Tube voltage drop 750-850v
Ballast resistor 100-150K
Operating current 5mA

I bought one in 1980 for my first laser :).

Proud Mary

Sat May 01 2010, 11:49AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

There's a few paragraphs on "re-gassing" HeNe tubes here:

cedric

Tue Jul 27 2010, 10:06AM

Registered Member #2941 Joined: Fri Jun 25 2010, 08:08AM
Location:
Posts: 143

10 to 20 second in the microwave some time work to give it a short new life...
I thing it does so by warming up the getter inside but I am not sure...

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