home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: sci.electronics
- Path: sparky!uunet!wupost!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!ucselx!newshub.sdsu.edu!chemteca.sdsu.edu!massoud
- From: massoud@chemteca.sdsu.edu (Massoud Ajami)
- Subject: Re: Old laser rejuvenation
- Message-ID: <massoud.57@chemteca.sdsu.edu>
- Sender: news@newshub.sdsu.edu
- Nntp-Posting-Host: 130.191.227.22
- Organization: San Diego State University
- References: <1992Aug26.043710.27944@vpnet.chi.il.us>
- Distribution: usa
- Date: Wed, 26 Aug 1992 18:26:03 GMT
- Lines: 32
-
- In article <1992Aug26.043710.27944@vpnet.chi.il.us> cgordon@vpnet.chi.il.us (gordon hlavenka) writes:
-
-
- >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!
-
- You have lost the gas. You woudln't expect helium gas stays in the
- tube forever?
-
-
- Peace and Prosperity!
- ---==< 110 >==---
-