Nonlinear refractive index n2 is the material parameter, which is used to describe the strength of phenomena caused by third-order nonlinearity, so measuring it accurately is one of the key tasks of nonlinear optics. Several techniques to estimate n2 of the PCF have been demonstrated, but for example Z-scan is not suitable for any type optical fibers, because this method only allows to estimate n2 of the material preform of the PCF. Other methods, such as four-wave mixing, self-phase modulation, cross-phase modulation allow qualitatively good estimation of n2 only when pump wavelength is close to the zero dispersion wavelength (ZDW) of the optical fiber. In this paper, we present a new method of polarization-maintaining photonic crystal fiber nonlinear refractive index measurement using phase shift between orthogonal polarization modes.
Nonlinear light propagation inside the medium can be analyzed using the concept of nonlinear refractive index. Unique and popular nonlinear media with enhanced nonlinearity are photonic crystal fibers (PCFs). To numerically simulate nonlinear light propagation inside a PCF it is necessary to properly evaluate the fiber’s nonlinear refractive index at different wavelengths. This work presents a new method to measure nonlinear refractive index in optical fibers, which allowed to estimate the nonlinear refractive index of PCF over a broad range of wavelengths.
This work has received funding from European Regional Development Fund (project No. 01.2.2-LMT-K-718-03-0004) under grant agreement with the Research Council of Lithuania (LMTLT).
Supercontinuum generated in optical fibers due to various nonlinear processes has a very broad spectrum and it is one of the most important and analyzed nonlinear optics phenomena, which has many important applications. Although a wide variety of supercontinuum generation in PCFs research has been done, research in which the length of a short PCF is changed in small steps has not been performed. Since extremely rapid spectrum extension in femtosecond regime of supercontinuum generation occurs in the first few centimeters of the PCF, comprehensive knowledge of spectrum evolution is necessary to improve efficiency of this nonlinear processes. In this paper we present our experimental of light generation in short PCF, when fiber length was changed in small steps using ~ 110 fs duration and 1030 nm wavelength pulses pumping.
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