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 Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/25714
 Title: Nonlinear Parametric Generation in Birefringent Poled Fibers Authors: Zhu, Eric Yi Advisor: Qian, Li Department: Electrical and Computer Engineering Keywords: Nonlinear OpticsOptical FibersSecond-Harmonic Generation Issue Date: 3-Jan-2011 Abstract: Conventional step-index silica fibers do not possess a second-order optical nonlinearity due to symmetry concerns. However, through the process of poling, the generation of a frozen-in DC field $E^{DC}$, and in turn, a non-zero second-order nonlinearity $\chi^{(2)} = 3\chi^{(3)}E^{DC}$, can be created in optical fibers. In this thesis, I measure the individual $\chi^{(2)}$ tensor elements of birefringent periodically poled fiber via second-harmonic generation and sum-frequency generation experiments. The symmetry of the $\chi^{(2)}$ tensor is consistent with that of the $\chi^{(3)}$ for isotropic media. This is the first study that characterizes all the $\chi^{(2)}$ tensor elements in birefringent poled fiber. Furthermore, I investigate the intermix of the $\chi^{(2)}$ tensor elements by twisting the fiber, which results in the generation of new second-harmonic signals not observed in untwisted fiber. The conversion efficiencies and spectral positions of these new signals can be varied by twisting the fiber. URI: http://hdl.handle.net/1807/25714 Appears in Collections: MasterThe Edward S. Rogers Sr. Department of Electrical & Computer Engineering - Master theses