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在掺镱锁模光纤激光器发出的皮秒脉冲的抽运下,本文报道了双零色散的多芯光子晶体光纤中可见光超连续谱的产生.这种光子晶体光纤的类似同轴双芯结构提供了相隔很近的双零色散点.第二个零色散波长的存在阻止了反常色散区内的由脉冲内拉曼散射引起的孤子的频移,形成了稳态孤子,在短波长和长波长方向上的正常色散区均产生了可观的色散波.在2 W的平均功率下得到了550 nm到1700 nm的超连续谱.此外,光纤的同轴双芯特性也导致了入射脉冲的模式转换.实验结果和数值计算十分符合.
The generation of supercontinuum of visible light in double zero-dispersion multicore photonic crystal fibers is reported in the paper by the picosecond pulse pumped by ytterbium-doped mode-locked fiber lasers. The similar coaxial dual-core structure of such photonic crystal fibers provides Close zero double-zero dispersion point.The existence of the second zero-dispersion wavelength prevents the soliton’s frequency shift caused by intra-pulsed Raman scattering in the anomalous dispersion region and forms a steady-state soliton at short wavelength and long wavelength The normal dispersion region in the direction produces a significant dispersion wave resulting in a supercontinuum of 550 nm to 1700 nm at an average power of 2 W. In addition, the coaxial dual-core nature of the fiber also results in a mode transition of the incident pulse The experimental results and numerical calculations are in good agreement.