Süperkesintisiz tayf üretimi için çoklu inceltilmiş kalkojen fiberlerin geliştirilmesi

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 elds such as spectroscopy, early cancer diagnostics, gas sensing, food quality control, Fuorescence microscopy e.t.c. Supercontinuum generation in optical bers 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 bers" 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 bers were also fabricated using a new method. The fabricated step index ber has a diameter 1.35 micron 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 ber possesses a great potential for severe spectral broadening. Supercontinuum generation with the as drawn ber, encountered challenges as well as proposed solutions were demonstrated and discussed.