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Sorry about that, it's unfortunate to lose one of the last remaining Liconix tubes. The BeO bores are usually segmented. No one made long enough pieces, so you'll always see a frit joint or even a metal joining collar. Typically, these are the points of breakage. On Coherent alumina bore...

You had a functioning Liconix head up until recently? Wow. I haven't worked on one since 1992. Liconix starting making doubled and tripled yag lasers not too long after that. They then underwent a name change to DPSS Lasers, trying to crash the stereolithography market. I can't remember, is...

I thînk you misread my response. Gas leaking from an autfill reservoir is one mode of increasing gas pressure failure and the other is trapped gas in the bore outgassing over time. Early Coherent innova tubes had yet another unique but similar gas issue. They were prone to hydrogen outgassing...

Pressure. Parked ion lasers will drift up in pressure. Mostly from gas buried in the bore slowly outgassing or a leaking fill system, if so equipped. A cathode reactivation will at times both bury the excess gas ( placing the pressure within a more comfortable region where the starter can now...