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Helium-Neon Laser Tubes

Discussion in 'Electronic Repair' started by Josh Savory, Apr 4, 2013.

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  1. Josh Savory

    Josh Savory Guest

    Hi,

    I'm trying to repair some old helium-neon lasers for a physics lab (155SL Uniphase and 155 spectra physics). Is it possible to find replacement tubes for these lasers?

    Thanks,

    Josh
     
  2. tm

    tm Guest

    You might take the old tubes and soak them in Helium gas for a week or so.
    If their seals are in tact, that will replace the He that leaks out over
    time. Get one of those Mylar metalized balloons and put the tubes inside,
    fill with He gas and let it sit.

    HTH
    tm
     
  3. You might take the old tubes and soak them in helium
    This was a problem with the original LaserDisc players.

    By the way, at least one expert is predicting that, because we're using so
    much helium for trivial purposes, in 50 years or so we won't have any for
    scientific use.
     
  4. Josh Savory

    Josh Savory Guest

    This might work but the tubes are physical broken from students dropping the lasers or just general abuse. I was hopping someone had a stockpile of these tubes.
     
  5. Guest

    Sam's Laser FAQ http://www.repairfaq.org/sam/laserfaq.htm has a section
    on where to get laser parts:
    http://www.repairfaq.org/sam/laserlps.htm#lpsnsw . He also has some
    tubes and other laser parts for sale at
    http://www.repairfaq.org/sam/sale/#scpheneh .

    I took the liberty of cross-posting this reply to alt.lasers, as it
    still seems to get some traffic. Followups set to s.e.d.

    Standard disclaimers apply; I don't get money or other consideration
    from any companies mentioned.

    Matt Roberds
     
  6. Do you have a service manual for a pioneer LD-1000, or do you need one for
    parts?

    For anybody else, it's a top loading laserdisc player, complete with the
    fake wood- it would blend in nicely with quadrophonic sound system.
     
  7. jules

    jules Guest

    Le 05/04/2013 03:42, a écrit :Yes.

    First of all, let us know what you need with this laser :
    1/ Color
    2/ Power
    3/ Divergence
    4/ Beam size
    5/ Wave for interferences

    You can replace a gas laser by a laser-diode and so on.

    Richard
     
  8. I'm trying to repair some old helium-neon lasers for a physics lab
    The 155SL uses a JDSU 098 or similar long barcode scanner tube. These
    are readily available. I may be able to dig up a couple.

    The 155 uses the old 060-4 side-arm tube. Electrically, it can also probably
    use the 098, but fitting it in may be a problem.

    It may be better to simply buy some more modern HeNe lasers surplus. I have many
    available, though probably not quite as cheap as eBay. :)

    --
    sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
  9. Do you have an idea of the make and model of the tube? Most of these
    are hard-seal and never suffer from He depletion. And even those
    that have Epoxy seals often leak air in more quickly than He out.

    However, you have He and nothing to lose, so put it in a bag of He
    at atmospheric pressure for approximately 1 day per year of age.
    So, if it's about 20 years old, try 3 weeks. Remove it and test
    periodically. If you go overpressure on He, there's no way to get it
    down quickly.

    --
    sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
  10. It's tricky to power a HeNe tube inside a He atmostphere due to an increased
    tendency for HV breakdown. Or, so I've heard. One would have to do it
    in such a way that the high voltage parts are isolted from the He, but those
    are often exactly where the He needs to diffuse in. I haven't tried. :)

    --
    sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
  11. Sometimes it takes awhile to start, especially if it hasn't been used in
    20 years. Shining a light on the tube can may help.

    Take some pics.

    --
    sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
  12. Apparently I had one of those uniphase lasers. The tube was hard sealed,
    but the thing died when it was dropped and the mirrors got knocked out of
    alignment. I still have the transformer and probably the extruded case.

    the thing was super super simple inside.
     
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