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相关概念视频

Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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高性能光子单侧波段调制器用于冷原子干涉测量.

Ashok Kodigala1, Michael Gehl1, Gregory W Hoth1

  • 1Sandia National Laboratories, 1515 Eubank Blvd SE, Albuquerque, NM 87123, USA.

Science advances
|July 10, 2024
PubMed
概括

我们使用光子学小型化了原子干扰仪的激光系统. 这使得通过将功能集成到光子芯片上,能够实现紧的量子传感器,并展示精确的重力测量.

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科学领域:

  • 量子光学和原子物理学
  • 综合光子学和设备工程.
  • 精确测量和传感器技术的技术.

背景情况:

  • 激光系统对于光脉冲原子干扰仪 (LPAI) 来说至关重要,使量子引力和惯性传感成为可能.
  • 微型化和LPAI的坚固化需要整合复杂的激光功能.
  • 光子集成电路为实现紧且强大的量子传感器提供了一条道路.

研究的目的:

  • 为LPAI应用开发和演示一个高性能光子抑制载体单侧带 (SC-SSB) 调制器.
  • 在小型的LPAI系统中实现动态频率转移和精确控制激光参数.
  • 通过展示关键的LPAI功能和测量引力加速来验证集成光子调制器的性能.

主要方法:

  • 设计和制造一个在1560 nm运行的光子SC-SSB调制器.
  • 无线电频率 (RF) 频道的独立控制以实现载波和侧带抑制.
  • 调查射频信号幅度和相位不平衡.
  • 将调制器集成到光脉冲原子干扰仪装置中,使用卢比-87原子.

主要成果:

  • 实现了30dB的载波抑制和47.8dB的侧带抑制,峰值转换效率为-6.846dB (20.7%).
  • 通过光子系统成功证明了冷原子生成和状态选择性检测.
  • 观察到清晰的原子干扰仪边缘,使得可以测量引力加速.

结论:

  • 开发的光子SC-SSB调制器适用于小型化和坚固化的LPAI.
  • 集成光子学可以有效地取代量子传感器中的复杂离散激光元件.
  • 展示的系统提供了精确测量引力加速 (g ≈ 9.77 ± 0.01 m/s2),为便携式量子惯性传感器铺平了道路.