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Thread: Co2 Laser Re-Gas discussion

  1. #1
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    Default Co2 Laser Re-Gas discussion

    Any one tried at re gassing a co2 laser ?

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    Yes. It can be done, and itís RELATIVELY straightforward as far as reprocessing goes, but itís rarely worth the effort and expense involved; in many cases itís both easier and less expensive to just pop in a new tube. For the most part, tubes on CO2 lasers are regarded as a consumable.

    Just out of curiosity, why?

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    RF excited and medical tubes are done all the time. I've pumped one DC tube myself, but I do not have Xenon and Carbon Monoxide on station, so lifetime was short.

    Steve

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    I processed the GTE Sylvania / Spectra-Physics / Line Lite Laser line of sealed CO2 lasers in the early '80s. Still have the formula in a file I'm sure.

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    Totally right, Steve- medical is a whole different story.
    ...BIG material processing gear- Sure.
    ...RF excited tubes of decent power- Sure.
    Glass tubes for a far-east desktop cutter- nah.

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    Quote Originally Posted by Eidetic View Post
    I processed the GTE Sylvania / Spectra-Physics / Line Lite Laser line of sealed CO2 lasers in the early '80s. Still have the formula in a file I'm sure.
    ... d'you feel like looking for it?

    Viktor

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    It is excitation, cooling, catalyst, tube and optics dependent. RF tubes get a different mixture that self catalyzes in a different way then DC tubes.
    ~
    I'll give you an example based on three RF heads I own...
    ~
    Diffusion Cooled RF lasers start with the ratio of 3:1:1 + 5% Helium, Carbon Dioxide, Nitrogen then add Xenon at 5% of best fill pressure.
    ~
    Then traces of Carbon Monoxide, Hydrogen, Argon, Oxygen, and/ or Water Vapor can be added, but what is used is design and catalyst dependent. Each manufacturer tweaks the mixture for best lifetime. Three One One is only a starting guide used in laser research. Helium is sometimes added all the way out to 8:1:1.
    ~
    With a Gold catalyst, you can expect nearly 1% Carbon Monoxide.
    ~
    ------------------------------------------------------------------

    The reason for all the tweaking is to control the percentage of disassociated Co2 in the tube plasma to near optimum at 40-50%.

    ----------------------

    Old flowing gas medical systems using DC and water cooling use: 9.5% CO2, 13% nitrogen, and 77% Helium, sometimes with a trace of Xenon.

    Steve
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  8. #8
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    Laser Warning is it possible to get the gas formula ?

    ive got all the equipment needed and partially sucsesfull at recharging and old 40 watt tube,
    but i only get about 50% power
    any thoughts?

    Quote Originally Posted by Eidetic View Post
    I processed the GTE Sylvania / Spectra-Physics / Line Lite Laser line of sealed CO2 lasers in the early '80s. Still have the formula in a file I'm sure.

  9. #9
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    Quote Originally Posted by sinfocomp View Post
    ive got all the equipment needed and partially sucsesfull at recharging and old 40 watt tube,
    but i only get about 50% power
    any thoughts?
    We need more info. What kind of tube? What were your processing steps+times? Do you have diagnostic or instrumentation data from your vacuum+gas handling system?

  10. #10
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    Quote Originally Posted by CountFunkula View Post
    We need more info. What kind of tube? What were your processing steps+times? Do you have diagnostic or instrumentation data from your vacuum+gas handling system?
    First i pull vacumm to 0.01torr, then fill to atm using c02, then pull vacumm to 0.1torr again (to flush the tube), then i add the laser mix to atm, then i set my psu to the correct current for tube and pull vacumm to get the most power output, run tube for 1 hr , let sit 24hrs and re adjust vacumm as necesary to obtain peak power, seal tube, done.

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