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Theoretical and experimental study of the nonlinear optical and dispersive properties of conventional and photonic crystal fibers.

机译：常规和光子晶体光纤的非线性光学和色散特性的理论和实验研究。

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摘要

The early use of the induced grating autocorrelation (IGA) method to measure the nonlinear refractive index of single mode fibers utilized 50-70 ps pulses at 1064-nm and required only 15-20 m lengths of fiber. Exotic fibers, such as photonic crystal fibers (PCFs), are extremely expensive and limit many applications to a few meters. Therefore, a practical measurement of the nonlinear coefficient for such exotic fibers requires a technique sensitive to shorter fiber lengths ( 5 m). To reduce the fiber length requirements, the IGA technique must use shorter pulses.;In this work, a new mathematical description was developed for the IGA technique that is applicable to pulses as short as 100 fs. This model includes effects such as dispersion, self-phase modulation, stimulated Raman scattering, intra-pulse Raman scattering and self-steepening. The model was used to investigate pulse propagation at three pulsewidths: 50 ps, 2 ps, and 120 fs. The model predicted the sensitivity of IGA measurements to dispersive and nonlinear effects at these pulsewidths.;The numerical model led to the successful experimental determination of both the dispersion and nonlinear coefficients of a 15m long single-mode fiber using a 2 ps Ti: sapphire laser at 800 nm. The nonlinear coefficient for several PCFs (a 30 cm long highly nonlinear PCF and two large mode area PCFs of 4.5 m and 4.9 m long) were also successfully measured with excellent numerical fits using this new IGA model.
机译：早期使用感应光栅自相关（IGA）方法来测量单模光纤的非线性折射率是利用1064-nm处的50-70 ps脉冲，仅需要15-20 m的光纤长度。外来光纤，例如光子晶体光纤（PCF），非常昂贵，并将许多应用限制在几米之内。因此，对于此类奇异纤维的非线性系数的实际测量需要一种对较短纤维长度（<5 m）敏感的技术。为了减少对光纤长度的要求，IGA技术必须使用更短的脉冲。在这项工作中，为IGA技术开发了一种新的数学描述，适用于短至100 fs的脉冲。该模型包括诸如色散，自相位调制，受激拉曼散射，脉冲内拉曼散射和自增强等效应。该模型用于研究三种脉冲宽度下的脉冲传播：50 ps，2 ps和120 fs。该模型预测了在这些脉冲宽度下IGA测量对色散和非线性效应的敏感性。数值模型导致成功地使用2 ps Ti：蓝宝石激光器对15m长单模光纤的色散和非线性系数进行了实验确定。在800 nm使用这种新的IGA模型，还成功地以良好的数值拟合成功地测量了多个PCF的非线性系数（一个30 cm长的高度非线性PCF和两个4.5 m和4.9 m长的大模态PCF）。

著录项

  • 作者

    Kuis, Robinson.;

  • 作者单位

    University of Maryland, Baltimore County.;

  • 授予单位 University of Maryland, Baltimore County.;
  • 学科 Physics Optics.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 115 p.
  • 总页数 115
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:38:19

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