【摘要】 报道了利用20 fs激光脉冲在两种多孔微结构光纤产生超连续谱的现象,光纤长度均为40 cm,连续谱展宽范围分别是420-980 nm和570-920 nm。实验上证明了不仅仅具有周期性结构的微结构光纤可以用于产生超连续谱,由无序填充气孔组成的多孔微结构光纤也可以出现类似的超强非线性和超连续谱展宽。分析表明,小模场面积和高非线性系数更有利于产生宽的超连续谱,不完全光子带隙的存在导致了光谱的分立结构。更多还原

【Abstract】 It is reported that supercontinuum spectrums can be generated in two holey microstructure fibers launched by the 20 fs laser pulse train from a Ti:sapphire laser oscillator. Broadband continua extending from 420 to 980 are obtained in the microstructure with random air lines. It is found that not only MF with periodical air lines but also MF with random air lines can be used to generate supercontinuum. Analysis indicates that smaller effective mode area and higher nonlinear coefficient are propitious to the supercontinuum generation.更多还原