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      • Graduate Program in Materials Science and Nanotechnology - Master's degree
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      • Bilkent Theses
      • Theses - Graduate Program in Materials Science and Nanotechnology
      • Graduate Program in Materials Science and Nanotechnology - Master's degree
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      Development of multicore and tapered chalcogenide fibers for supercontinuum generation

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      Embargo Lift Date: 2018-03-16
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      Author
      Saleh, Abba Usman
      Advisor
      Ortaç, Bülend
      Date
      2016-12
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
      Item Usage Stats
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      Abstract
      The dramatic spectral broadening of an electromagnetic radiation as it propagates through a nonlinear medium is called Supercontinuum generation. Supercontinuum generation is indeed regarded as one of the prominent phenomenon in nonlinear optics and photonics with burgeoning applications in various fields such as spectroscopy, early cancer diagnostics, gas sensing, food quality control, uorescence microscopy e.t.c. Supercontinuum generation in optical fibers is however associated with three fundamental challenges: minimization of input power threshold, maximization of output power as well as output spectrum of a supercontinuum. Two unique fabrication approaches namely "Direct tapering" and "Multicore fibers" were proposed to address the aforementioned challenges. Chalcogenide nanowires were fabricated via direct tapering of chalcogenide glasses, and spectral broadening with extremely low peak power of 2 W was demonstrated. Multicore array of chalcogenide step index fibers were also fabricated using a new method. The fabricated step index fiber has a diameter 1.35 m which was engineered to have a zero dispersion wavelength (ZDW) around 1100 nm with a pump of center wavelength at 1550 nm .Using split step Fourier method, it was shown that the fiber possesses a great potential for severe spectral broadening. Supercontinuum generation with the as drawn fiber, encountered challenges as well as proposed solutions were demonstrated and discussed.
      Keywords
      Supercontinuum generation
      Zero dispersion wavelength (ZDW)
      Chalcogenide
      Step index fiber
      Tapering
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      http://hdl.handle.net/11693/32605
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      • Graduate Program in Materials Science and Nanotechnology - Master's degree 142
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