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相关概念视频

Nuclear Stability03:18

Nuclear Stability

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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
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Atomic Orbitals02:44

Atomic Orbitals

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An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
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Hydronium and hydroxide ions are present both in pure water and in all aqueous solutions, and their concentrations are inversely proportional as determined by the ion product of water (Kw). The concentrations of these ions in a solution are often critical determinants of the solution’s properties and the chemical behaviors of its other solutes. Two different solutions can differ in their hydronium or hydroxide ion concentrations by a million, billion, or even trillion times. A common means of...
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Overview
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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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通过单立体集成的被动腔体实现1MHz线宽VCSEL,用于高稳定性芯片级原子钟.

Zhiting Tang1, Chuanlin Li1, Xuhao Zhang1

  • 1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731, China.

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概括

我们为原子钟开发了一种新的垂直腔表面发射激光器 (VCSEL). 这种紧的VCSEL实现了~1MHz的狭窄线宽,改善了量子传感器和引用的频率稳定性.

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科学领域:

  • 光子学和量子技术的使用.
  • 激光物理与工程 激光物理与工程

背景情况:

  • 传统的垂直空腔表面发射激光器 (VCSEL) 由于空腔长短和自发发射,导致宽线宽,对精密应用有局限性.
  • 窄线宽激光器对于芯片级原子钟和量子传感器至关重要,但在紧的VCSEL中实现这一目标仍然是一个挑战.

研究的目的:

  • 为了证明一个具有内在线宽压缩的单立体集成VCSEL,以提高频率稳定性.
  • 开发一个适合下一代量子启用频率参考和传感平台的VCSEL架构.

主要方法:

  • 设计和制造了一个VCSEL与相邻的被动腔,以延长光子寿命和抑制不必要的模式.
  • 描述了VCSEL的光学性能,包括线宽,单模式运行,侧模式抑制比 (SMSR) 和极化抑制比 (OPSR).
  • 将VCSEL集成到蒸汽电池原子钟中,以评估其在现实应用中的性能.

主要成果:

  • 在没有外部反的情况下,在D1线 (894.6nm) 上实现了大约1MHz的内在线宽压缩.
  • 在广泛的电流和温度范围内,经过SMSR> 35dB和OPSR> 25dB的强大的单模式操作.
  • 观察到光束差距大约为7°.
  • 集成的VCSEL使原子钟的频率稳定性达到1.89 × 10-12 τ-1/2.

结论:

  • 具有嵌入式被动空腔的新型VCSEL架构成功实现了显著的线宽减少.
  • 展示的VCSEL是芯片级原子钟和量子传感器的紧,可扩展和高性能解决方案.
  • 这项技术为下一代便携式和强大的量子支持设备铺平了道路.