高非线性液芯光子晶体光纤中超连续谱的产生 |
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引用本文: | 张会,郭澎,常胜江,袁景和.高非线性液芯光子晶体光纤中超连续谱的产生[J].中国激光,2008,35(s1):134-138. |
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作者姓名: | 张会 郭澎 常胜江 袁景和 |
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作者单位: | 张会:南开大学现代光学研究所光电信息科学教育部重点实验室, 天津 300071 郭澎:南开大学现代光学研究所光电信息科学教育部重点实验室, 天津 300071 常胜江:南开大学现代光学研究所光电信息科学教育部重点实验室, 天津 300071 袁景和:烟台大学光电信息科学与技术学院, 山东 烟台 264005
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基金项目: | 国家973计划(2007CB310403)、天津市自然科学基金重点项目(07JCZDJC05500)和国家自然科学基金(60772105)资助课题。 |
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摘 要: | 提出了一种实现高非线性光子晶体光纤(PCF)的新方法,即在空芯光子晶体光纤(HC-PCF)的纤芯空气孔中填充高折射率、高非线性折射率的液态物质三氯甲烷、甲苯、二硫化碳等。利用全矢量有限元方法分析了这种液芯光子晶体光纤的模式分布及色散性质,分析得出其零色散波长可在800 nm左右调节,因此可使中心波长800 nm的钛宝石飞秒脉冲激光在这种光子晶体光纤的反常色散区传输,有利于超连续谱的产生。而且由于填充后光子晶体光纤具有较高的非线性系数,较小功率的脉冲激光就可在几毫米长的这种液芯光子晶体光纤中得到频谱范围大于1000 nm的超连续谱。
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关 键 词: | 非线性光学 高非线性光子晶体光纤 超连续谱 色散 |
Supercontinuum Spectra Generation in the Highly Nonlinear Liquid-Core Photonic-Crystal Fiber |
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Abstract: | A novel method to realize a highly nonlinear photonic crystal fiber (PCF) is reported. In this method, the core of the hollow core-PCF (HC-PCF) is filled with highly nonlinear liquids, such as carbon disulfide, chloroform and methylbenzene. The transmitting characteristics, fundamental mode distribution and dispersion features of the liquid-filled PCFs are studied by using the full-vector finite element method. Numerical results indicate that the zero-dispersion wavelength of the liquid-filled PCF can be tuned around 800 nm. And the propagation of femtosecond pulses laser with central wavelength at 800 nm through the liquid-filled PCF in its anomalous dispersion regime is numerically simulated. As the liquid-filled PCF demonstrates highly nonlinear coefficient, the liquid-filled PCF is capable to generate dramatically broadened supercontinuum about 1000 nm through several micrometers distance. |
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Keywords: | nonlinear optics highly nonlinear photonic crystal fiber supercontinuum spectra dispersion |
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