home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!cis.ohio-state.edu!pacific.mps.ohio-state.edu!zaphod.mps.ohio-state.edu!moe.ksu.ksu.edu!kuhub.cc.ukans.edu!wellison
- From: wellison@kuhub.cc.ukans.edu
- Newsgroups: sci.electronics
- Subject: Re: Old laser rejuvenation
- Message-ID: <1992Aug27.164907.42610@kuhub.cc.ukans.edu>
- Date: 27 Aug 92 16:49:05 CDT
- Organization: University of Kansas Academic Computing Services
- Lines: 18
-
-
- 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.
-
- My largest HeNe is a Jodon 1575 which is 35mW and circa 1967. Believe it or
- not, it still works just fine. It's a big sucker though :-) It has a dual
- filament, which I thought was rather strange to begin with, as moderen HeNe's
- don't have filaments, but one had burned out and the University tossed it out.
- So I rescued it out of the dumpster and took it home. I simply changed the
- filament lead to the secondary filament and she works fine (about 32mW output).
- With the cost of HeNe's so low, it might be better just to replace the tube
- rather than to mess with trying to re-gas it. But I like one posters idea of
- filling a garbage sack with He and sticking the tube in it for a few days. I'll
- have to try that just for the fun of it !
-
- -=-=- Wes =-=-
-