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- Newsgroups: sci.electronics
- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!wupost!usc!rpi!newsserver.pixel.kodak.com!laidbak!tellab5!vpnet!cgordon
- From: cgordon@vpnet.chi.il.us (gordon hlavenka)
- Subject: Old laser rejuvenation
- Message-ID: <1992Aug26.043710.27944@vpnet.chi.il.us>
- Organization: Vpnet Public Access
- Distribution: usa
- Date: Wed, 26 Aug 1992 04:37:10 GMT
- Lines: 23
-
-
- I have an _ancient_ laser which almost works. It's a HeNe laser,
- model 3100 from Gaertner Scientific (circa 1969). It worked for a
- while, but now has developed an electrical problem.
-
- This laser, when you get down to it, is basically an expensive beer
- sign with a couple of mirrors hung on it. The tube does not run
- continuously any longer. It flickered for a while, and now it just
- fires in bursts.
-
- The power supply consists of 2 transformers, 4 diodes, 6 resistors,
- and 2 big capacitors. My first guess is that the caps have become
- leaky. Any tips?
-
- It _does_ lase, when the tube fires. So the optics are OK.
-
- (Yes, I know that for $50 I can buy a semiconductor laser with more
- power and a better beam shape. That's not the point.)
-
- --
- ----------------------------------------------------
- Gordon S. Hlavenka cgordon@vpnet.chi.il.us
- Don't forget: Dave Barry/Joe Walsh in November!
-