22 April 2008 Single-sided supercontinuum generation in a photonic crystal fiber by selective excitation of the third-order mode
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Abstract
We describe an experiment in which a supercontinuum spectrum is generated by exciting the third-order mode of a highly nonlinear photonic crystal fiber (PCF). Our experiment consists of launching a train of femtosecond pulses into a 45-cm-long span of a PCF by means of an offset pumping technique that can selectively excite higher-order modes. For input wavelengths below 810 nm, the fiber was found to allow for the propagation of higher-order modes. When exciting the third-order mode we were able to generate an almost purely visible supercontinuum even with pulse energies below 100 pJ. Although the spectrum broadens on the short-wavelength side down to the blue region, no components at wavelengths larger than the pump wavelength were observed. The mechanism behind the spectral broadening is mainly ruled by soliton propagation leading to the generation of a blue-shifted dispersive wave. The fact that higher-order modes have a cut-off wavelength plays a fundamental role that accounts for the observed asymmetry of spectral broadening. Our experimental results are compared with the numerical solutions of the nonlinear Schrödinger equation. Good agreement between experimental and numerical results is found.
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Rim Cherif, Rim Cherif, Mourad Zghal, Mourad Zghal, Luca Tartara, Luca Tartara, Vittorio Degiorgio, Vittorio Degiorgio, } "Single-sided supercontinuum generation in a photonic crystal fiber by selective excitation of the third-order mode", Proc. SPIE 6990, Photonic Crystal Fibers II, 69900O (22 April 2008); doi: 10.1117/12.780503; https://doi.org/10.1117/12.780503
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