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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.
779

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相关实验视频

Updated: Jun 13, 2025

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
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在芯片上进行5秒脉冲放大.

Mahmoud A Gaafar1, Markus Ludwig1, Kai Wang2

  • 1Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany.

Nature communications
|September 16, 2024
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概括
此摘要是机器生成的。

研究人员在芯片上实现了秒激光脉冲的50倍以上的放大,达到800瓦的峰值功率. 这一突破为各种应用提供了紧的,高功率的秒源.

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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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科学领域:

  • 光子学是指光子学的使用方法.
  • 超快速科学 超快速科学
  • 集成光学 集成光学 集成光学

背景情况:

  • 五秒激光脉冲对于合成光和研究超快现象至关重要.
  • 在诊断和传感等应用中,需要芯片集成的秒源.
  • 目前的芯片内源缺乏足够的峰值功率,阻碍了实际应用.

研究的目的:

  • 为了克服在芯片上放大秒脉冲的挑战.
  • 开发一种CMOS兼容的光子芯片,能够产生高功率的五秒钟脉冲.
  • 为了实现芯片集成的秒技术,其功率水平与桌面系统相提并论.

主要方法:

  • 利用全正常分散,大模式区域波导和稀土兴奋剂来缓解非线性效应.
  • 实现了一个CMOS兼容的光子芯片,用于放大1GHz的重复率的声femtosecond脉冲.
  • 实现了>50倍的秒脉冲放大.

主要成果:

  • 产生增强的秒脉冲,峰值功率为800W,脉冲持续时间为116 fs.
  • 显示的峰值功率比以前的芯片上源高出2-3个数量级.
  • 通过波导设计和分散管理,成功地减轻了有害的非线性影响.

结论:

  • 这项工作为实现芯片集成的高峰功率的秒技术提供了一条道路.
  • 开发的技术可以为诊断,成像,传感和导航中的关键应用提供动力.
  • 结果为芯片上的紧,强大的femtosecond源铺平了道路.