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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

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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: Overview01:12

Double Resonance Techniques: Overview

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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.
Spin decoupling is usually achieved by...
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Rectangular and Triangular Pulse Function01:19

Rectangular and Triangular Pulse Function

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The unit rectangular pulse function is mathematically represented by a rectangular function centered at the origin with a height of one unit. This function is defined by two parameters: T, which specifies the center location of the pulse along the time axis, and τ, which determines the pulse duration.
For example, consider a rectangular pulse with a 5V amplitude, a 3-second duration, and centered at t=2 seconds. This pulse can be expressed using the rectangular function, written as,
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Updated: Jul 12, 2025

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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倾斜脉冲前技术,用于高效的太赫兹脉冲生成.

György Tóth1, Gyula Polónyi2,3, János Hebling4,5,6

  • 1University of Pécs, Pécs, 7624, Hungary.

Light, science & applications
|October 23, 2023
PubMed
概括
此摘要是机器生成的。

倾斜脉冲前 (TPFP) 显著提升了太赫兹 (THz) 脉冲的产生,使高能脉冲用于实验和THz驱动加速器. 这一审查涵盖TPFP的TPFP.

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科学领域:

  • 光学和光子学 在光学和光子学.
  • 太赫兹 (THz) 科学和技术

背景情况:

  • femtosecond激光脉冲的光学校正是产生单循环和几循环THz脉冲的主要方法.
  • 20年前开发的倾斜脉冲前 (TPFP) 技术彻底改变了THz源的发展.
  • 高能THz脉冲对于THz探头实验,材料控制和未来的THz驱动粒子加速器至关重要.

研究的目的:

  • 在过去二十年中,利用TPFP进行THz脉冲生成的成就提供了全面的回顾.
  • 分析传统的TPFP设置,其局限性,以及克服这些限制的新型配置.
  • 调查用于THz生成的材料的光学特性及其适用于TPFP的适用性.

主要方法:

  • 对TPFP在THz脉冲生成方面的开创性成就的回顾.
  • 分析传统和新型TPFP配置及其性能.
  • 深入分析THz吸收,折射率和酸和半导体中的非线性系数的深度光谱分析.

主要成果:

  • TPFP使基酸盐的有效速度匹配成为可能,这对于高能量的THz产生至关重要.
  • 将TPFP适应半导体THz源导致转换效率提高了200倍.
  • 新型TPFP配置在超越THz源的扩展限制方面显示出前景.

结论:

  • TPFP是一种通用而强大的技术,用于在各种材料平台上推进THz脉冲生成.
  • 了解材料的光学特性是优化THz源性能的关键.
  • 对于基酸盐,半导体,有机晶体和基于GaP的THz源,TPFP提供了显著的优势.