Silica-clad crystalline germanium core optical fibers.

  title={Silica-clad crystalline germanium core optical fibers.},
  author={John Ballato and Thomas W. Hawkins and Paul Foy and Stephanie Morris and Nick K. Hon and Bahram Jalali and Robert R. Rice},
  journal={Optics letters},
  volume={36 5},
Silica-clad optical fibers comprising a core of crystalline germanium were drawn using a molten core technique. With respect to previous fibers drawn using a borosilicate cladding, the present fibers exhibit negligible oxygen despite being fabricated at more than twice the melting point of the germanium. The counterintuitive result of less oxygen when the fiber is drawn at a higher temperatures is discussed. The measured propagation loss for the fiber was 0.7 dB/cm at 3.39 μm, which is the… 

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