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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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相关实验视频

Updated: Apr 7, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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使用单个激光器在芯片上的全光频率划分

Yun Zhao1,2, Jae K Jang1, Garrett J Beals1

  • 1Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, USA.

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|March 12, 2024
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概括
此摘要是机器生成的。

这项研究展示了芯片上的全光学频率分割 (OFD),使用单个激光和同步微振器产生高质量的微波信号. 这一突破简化了微波发电,

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科学领域:

  • 光子学和光学工程
  • 微波信号生成
  • 综合光学

背景情况:

  • 在测量和通信方面,光谱纯净的微波信号产生至关重要.
  • 使用光学频率的光学频率分割 (OFD) 提供高质量的微波生成.
  • 现有的OFD方法很庞大,需要复杂的稳定,阻碍了整合.

研究的目的:

  • 在光子芯片上展示全光学OFD技术.
  • 实现高质量的微波信号的芯片规模生成.
  • 克服当前OFD实施的局限性.

主要方法:

  • 通过单个连续波激光送的Kerr微振荡器的两个不同的动态状态.
  • 通过克尔单子将太赫兹节拍频率的稳定性转移到微波频率.
  • 使用合波导进行无电子锁定的同步.

主要成果:

  • 在光子芯片上成功展示了全光学OFD.
  • 达到的OFD系数为N = 34 (227 GHz) 和N = 468 (16 GHz).
  • 报告了16GHz单声的46dB阶段噪声降低,在集成光子平台上实现了最低的微波噪声.

结论:

  • 开发的全光学OFD方法简单,有效,并且与芯片兼容.
  • 这种方法可以在芯片上生成高质量的微波频率.
  • 开辟了用于计量和通信应用的紧,强大的设备的道路.