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相关概念视频

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

814
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
814

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在具有不对称增益的介质中非线性光学脉冲

S K Turitsyn1, A E Bednyakova2, E V Podivilov3

  • 1Aston Institute of Photonic Technologies, Aston University, Birmingham B4 7ET, United Kingdom.

Physical review letters
|October 28, 2023
PubMed
概括

一个新的模型描述了光脉冲在非线性介质中与不对称增益的传播. 这项研究揭示了不对称的光脉冲可以在不打断的情况下积累显著的非线性相位,有助于非线性光纤放大器设计.

科学领域:

  • 非线性光学是一种非线性光学.
  • 光学脉冲传播的传播方式
  • 光纤光学是指光纤的使用.

背景情况:

  • 非线性分散放大介质对于光学技术至关重要.
  • 了解这种介质中的光脉冲行为对于设备设计至关重要.
  • 不对称的增益可以显著改变脉冲动态.

研究的目的:

  • 介绍一种用于在非线性介质中以不对称增益传播光脉冲的新型模型.
  • 检查在增益扭曲介质中的不对称光脉冲的特性.
  • 调查脉冲行为和水力动力波浪断裂之间的关系.

主要方法:

  • 光脉冲传播的理论建模.
  • 脉冲动态的数值模拟.脉冲动态的数值模拟.
  • 对光学系统的修改浅水方程的推导.

主要成果:

  • 开发了一种通用模型,用于在具有不对称增益的非线性分散放大介质中进行光脉冲传播.
  • 不对称的光脉冲在理论上和数值上都具有特征.
  • 建立了光波现象和水力动力波浪断裂之间的类比.

结论:

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  • 衍生模型提供了对不对称光脉冲形成的洞察力.
  • 不对称脉冲可以积累大量的非线性相,而无需波折.
  • 这些发现对于设计先进的非线性光纤放大器至关重要.