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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.
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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为增强共振非线性相互作用塑造超快脉冲

Omri Meron1,2, Snir Nehemia1,2, Uri Arieli1,2

  • 1Condensed Matter Physics Department, School of Physics and Astronomy, Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 6997801, Israel.

Nano letters
|November 17, 2025
PubMed
概括
此摘要是机器生成的。

有形的超快脉冲增强了纳米结构中的共振非线性过程. 我们发现了两种增强模式,一种是补偿分散,另一种是使用反直觉的两极化进行建设性干扰.

关键词:
一致性控制是一致性控制.这是LSPR的LSPR.非线性光学是非线性光学.血性 血性的脉冲的塑造 脉冲的塑造超快的物理 超快的物理

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科学领域:

  • 非线性光学是一种非线性光学.
  • 量子控制是一种量子控制.
  • 塑制剂的使用方法

背景情况:

  • 有形的超快脉冲引导光物质相互作用.
  • 反对称的光谱相驱动非共振过渡.
  • 响应过渡会受到材料分散的影响,从而降低效率.

研究的目的:

  • 研究对共振多光子过渡的光谱相位效应.
  • 探索除分散补偿之外的增强机制.
  • 使用角光谱相成型来进行四波混合.

主要方法:

  • 亚-10 fs单脉冲四波混合实验.
  • 采用了对角弧的光谱相位成型.
  • 对非线性光学现象的理论分析.

主要成果:

  • 确定了对共振非线性过程的两个不同的增强模式.
  • 一个方案可以弥补物质分散.
  • 一个反直觉的制度诱导反对称的两极分化进行建设性干扰.

结论:

  • 面光谱相位塑造为增强共振非线性过程提供了新的途径.
  • 两个不同的机制有助于提高非线性效率.
  • 了解和顺序和质量因子的缩放行为是关键.