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相关概念视频

Biasing of P-N Junction01:16

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...

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相关实验视频

Updated: Jun 4, 2026

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

Published on: July 12, 2017

在空气中获得高增益的反向激光.

Arthur Dogariu1, James B Michael, Marlan O Scully

  • 1Mechanical and Aerospace Engineering Department, Princeton University, Princeton, NJ 08544, USA. adogariu@princeton.edu

Science (New York, N.Y.)
|January 29, 2011
PubMed
概括

研究人员开发了一种高增益空气激光器,用于远程检测危险气体和爆炸物. 这种反向激光技术可以通过在激光束返回时采样空气来检测局.

科学领域:

  • 激光物理学的激光物理学
  • 频谱学是一种光谱学.
  • 遥感是一种远程传感.

背景情况:

  • 危险气体和爆炸物的对峙检测至关重要.
  • 现有的方法在范围和灵敏度上可能有局限性.

研究的目的:

  • 为了开发一个远程抽取的,高增益的空气激光器,用于反向激光.
  • 为了实现对空中威胁的对峙检测.

主要方法:

  • 使用聚焦紫外线激光来进行送.
  • 采用分子氧的同时共振的两光子解离和原子氧碎片的送.
  • 在近红外区域获得高收益.

主要成果:

  • 在一毫米长的焦点区域中表现出高收益.
  • 在前向和后向方向观察到同样强大的激光.
  • 使用先前的激光火花解离实现了进一步的向后放大.

结论:

  • 低分歧的向后空气激光是可行的.
  • 这项技术为远程检测应用提供了有前途的功能.

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