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the active medium used in the first working laser ever constructed was?

  • A.A diamond block 
  • B.Helium-neon gas 
  • C.A ruby rod 
  • D.Carbon dioxide gas

Answer: C

The first working laser used a ruby rod.

Theodore Maiman built it at Hughes Research Laboratories in 1960, pumping a synthetic ruby cylinder with a photographic flash lamp to produce a deep red pulse at 694 nm.

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