研究目的
Exploring the properties of supercontinuum generation in higher-order modes of photonic crystal fibers, focusing on conditions necessary to retain a single-mode character of the output.
研究成果
The research demonstrates that pumping in higher-order modes can achieve supercontinuum generation in larger cores, but with significant output noise. Preliminary investigations suggest that symmetry breaking in PCFs may inhibit nonlinear mode coupling, indicating a potential pathway for achieving low-noise and single-mode output.
研究不足
The study highlights significant output noise under both pump conditions, indicating different criteria for nonlinear mode mixing from the low-noise threshold. Linear mode coupling due to fiber inhomogeneities is also a consideration.
1：Experimental Design and Method Selection:
The study involves nonlinear simulations integrating equations for modal amplitudes and fields in photonic crystal fibers. A technique of integrating nonlinear polarization and mode fields 'on the fly' on a real-space Fourier-Gauss grid is generalized to full-vectorial calculations.
2：Sample Selection and Data Sources:
The PCF structure supports 20 guided modes, with pump pulses of 300 kW peak power and durations of 100 fs and 1 ps.
3：List of Experimental Equipment and Materials:
Photonic crystal fibers with specific core structures and pump lasers.
4：Experimental Procedures and Operational Workflow:
The integration grid is overlaid on the PCF structure, and spectra after 10 cm propagation are analyzed.
5：Data Analysis Methods:
Spectra are averaged over 10 simulations seeded by one-photon noise.
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