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Related Concept Videos

Feedback control systems01:26

Feedback control systems

Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
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 Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
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 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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Related Experiment Video

Updated: Jul 1, 2026

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

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

Feedback control of an atom laser.

R G Dall1, C J Dedman, A G Truscott

  • 1ARC Centre of Excellence for Quantum-Atom Optics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, Australia.

Optics Express
|September 17, 2008
PubMed
Summary

We demonstrate real-time feedback control for atom lasers using metastable helium. This method actively manages the outcoupling location, reducing fluctuations for a more stable atom laser beam.

Area of Science:

  • Atomic physics
  • Quantum optics
  • Laser technology

Background:

  • Atom lasers are coherent matter-wave beams.
  • Controlling atom laser properties like frequency and amplitude is crucial for applications.
  • Existing methods for atom laser control have limitations in feedback speed.

Purpose of the Study:

  • To achieve real-time feedback control of an atom laser.
  • To utilize the unique properties of metastable helium atoms for enhanced control.
  • To reduce fluctuations in atom laser output.

Main Methods:

  • Exploiting ion production during the outcoupling process of metastable helium atoms.
  • Implementing an active feedback mechanism to control the spatial outcoupling location within the Bose-Einstein condensate.

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Gradient Echo Quantum Memory in Warm Atomic Vapor

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Last Updated: Jul 1, 2026

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  • Comparing the feedback speed and effectiveness with alkali atom lasers.

    • Main Results:

    • Achieved the first real-time feedback control of an atom laser.
    • Demonstrated active control over the spatial outcoupling location.
    • Observed significant reductions in frequency, amplitude, and spatial mode fluctuations.

    Conclusions:

    • Real-time feedback control is feasible for atom lasers.
    • Metastable helium atoms offer advantages for active atom laser stabilization.
    • This technique enhances the stability and quality of atom laser beams.