Ar laser failure

Karel Drbal drbal at
Thu Feb 13 18:39:41 EST 1997

Dear flowers,
I ask you whether anyone have recorded a strange laser failure (Ar-15mW,
air-cooled) in the BD instrument (FACSort). It happens almost everyday during
data acquisition. The laser power and current drops to zero and after approx. 1
minute come back to the normal value. Normal values for laser power and current
were OK. Nothing I have tested helps. The laser have 5000 hours which is close
to its lifetime.
My questions:
1) Could overheating be the cause?
2) How one can decide when the laser should be replaced?
Any other suggestions?

  Karel Drbal
  Laboratory of Leukocyte Antigens
  Institute of Molecular Genetics
  Academy of Sciences of the Czech Republic
  Videnska 1083
  142 20 PRAHA 4
  Czech Republic, Europe
  voice:  +42-2-4752589
  fax:    +42-2-4727979
  e-mail: drbal at

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