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Related Concept Videos

Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the aerosol...
Atomic Absorption Spectroscopy: Instrumentation01:22

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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.
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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.
Atomic Absorption Spectroscopy: Interference01:25

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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: Interference01:30

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

sp3d and sp3d 2 Hybridization

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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

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Published on: March 30, 2017

Optical isolator using an atomic vapor in the hyperfine Paschen-Back regime.

L Weller1, K S Kleinbach, M A Zentile

  • 1Joint Quantum Centre (JQC) Durham-Newcastle, Department of Physics, Durham University, Durham, UK. lee.weller@durham.ac.uk

Optics Letters
|February 6, 2013
PubMed
Summary

A novel optical isolator utilizes atomic vapor in the hyperfine Paschen-Back regime. This compact device demonstrates high isolation and transmission for optical applications.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Optics

Background:

  • Optical isolators are crucial components in preventing back-reflections in optical systems.
  • Traditional isolators often rely on bulky and lossy magneto-optic materials.
  • The Paschen-Back regime offers unique interactions between atomic energy levels and magnetic fields.

Purpose of the Study:

  • To develop a compact and efficient optical isolator.
  • To investigate the use of atomic vapor in the hyperfine Paschen-Back regime for optical isolation.
  • To characterize the performance of the proposed isolator.

Main Methods:

  • Experimental setup utilizing an isotopically pure 87Rubidium (87Rb) vapor cell.
  • Application of a 0.6 T magnetic field to achieve the hyperfine Paschen-Back regime.
  • Measurement of transmission spectra for a linearly polarized beam near the D2 line.
  • Comparison of experimental results with theoretical predictions.

Main Results:

  • Excellent agreement between experimental and theoretical transmission spectra.
  • Demonstration of a π/4 rotation for a linearly polarized beam.
  • Achieved optical isolation of 30 dB.
  • Observed optical transmission exceeding 95%.

Conclusions:

  • The atomic vapor optical isolator operates effectively in the hyperfine Paschen-Back regime.
  • The device offers a promising alternative to conventional optical isolators due to its compactness and high performance.
  • The excellent agreement between theory and experiment validates the proposed physical principles.