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Keywords:

  • dielectrics;
  • doping;
  • thin films;
  • microstructures;
  • photonics
Thumbnail image of graphical abstract

Modal gain per unit length versus launched pump power is predicted and measured in a 47.5 at.% Yb3+-doped potassium double tungstate channel waveguide. The highest measured gain exceeds values previously reported for rare-earth-ion-doped materials by two orders of magnitude.