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相关概念视频

Momentum And Radiation Pressure01:20

Momentum And Radiation Pressure

1.8K
An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container.
1.8K
Radiation Pressure: Problem Solving01:09

Radiation Pressure: Problem Solving

1.0K
The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force...
1.0K

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相关实验视频

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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微镜的辐射压力冷却和光机械不稳定性.

O Arcizet1, P-F Cohadon, T Briant

  • 1Laboratoire Kastler Brossel, Université Pierre et Marie Curie, Case 74, 4 place Jussieu, F-75252 Paris Cedex 05, France.

Nature
|November 3, 2006
PubMed
概括

高功率的光学干扰仪面临着辐射压力带来的挑战. 这项研究证明了微机械共振器中的光机械冷却和不稳定性,为量子基本状态实验铺平了道路.

科学领域:

  • 视觉机械学 视觉机械学
  • 量子光学是一种量子光学.
  • 精确度测量 精确度测量 精确度测量

背景情况:

  • 光学干扰度可以实现高灵敏度的移位检测.
  • 需要更高的光学功率来提高灵敏度,但引入辐射压力效应.
  • 由非线性合引起的光机械不稳定性,可以限制干扰仪的稳定性.

研究的目的:

  • 研究辐射压力对微机械共振器的动态影响.
  • 使用洞内辐射压力来证明对共振器动态的控制.
  • 探索微机械系统中达到量子基本状态的潜力.

主要方法:

  • 使用微机械共振器作为高精度光学腔中的镜子.
  • 监控高灵敏度的共振器位移.
  • 与腔体共振相对变化的激光解调,以诱导辐射压力效应.

主要成果:

  • 通过内腔辐射压力,观察到微共振器的显著降温到10凯尔文.
  • 证明了相反激光解调的高效加热.
  • 在共振器中诱导了辐射压力驱动的不稳定性.

结论:

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  • 内腔辐射压力提供了一个冷却微机械共振器的机制.
  • 视力机械不稳定性可以诱导和潜在的控制.
  • 进一步的研究可能能够观察微机械共振器的量子基本状态.