Abstract

By using a thick-walled SiO2 tube (25-mm outside diameter, 1-mm inside diameter), a soft-glass core containing Nd or Yb–Er has its alkali (and to a lesser extent its alkaline earth) components volatilized during drawing to give a good-quality laser fiber with Nd- or Yb–Er-doped cores.

© 1989 Optical Society of America

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