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中文摘要：
针对光子晶体光纤（PCF）在可见光波段的光谱展宽机制和特点,实验研究了入射激光的功率和中心波长等对超连续谱（SS）产生的影响,理论分析了光谱展宽的机制以及平坦度增大的原因。结果发现：在入射激光功率较低的情况下,利用包含色散、自相位调制、自变陡及脉冲内拉曼散射效应的非线性薛定谔方程可以准确地分析光谱的展宽情况,理论分析和实验结果一致;但是,当功率较高时,交叉相位调制及四波混频效应成为光谱在短波方向展宽不可忽略的重要因素。
英文摘要：
The supercontinum spectra generation in a polarization-maintained photonic crystal fiber（PCF） with hexahedron structure and SiO2 cure pumped by the Ti：sapphire femtosecond laser is studied theoretically and experimentally.The results show that when the pump power of the laser is low, the self-phase modulation, self-steeping and intrapulse Raman scattering obtained by the nonlinear Schrodinger equation, are in agreement with the experimental results.However, when the pump power is high, the cross phase modulation and four-wave mixing effects are unnegligible in the short wavelength region.
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