Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

3.2K
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,...
3.2K
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

1.8K
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
1.8K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Diversity, Assembly, and Habitat-Driven Dynamics of Microbial Communities in Eutrophic Dianchi Lake, Southwest China.

Microorganisms·2026
Same author

Analysis of Gut Microbiota in Individuals With Distinct Types of Chronic Rhinosinusitis.

The Laryngoscope·2025
Same author

Firmness Loss in Blueberry (Vaccinium corymbosum) Is Associated With Increased PG Activity, Upregulation of Softening-Related Genes, and Pectin Metabolism.

Journal of food science·2025
Same author

Endophytic <i>Colletotrichum fructicola</i> KL19 and Its Derived SeNPs Mitigate Cd-Stress-Associated Damages in <i>Spinacia oleracea</i> L.

Plants (Basel, Switzerland)·2024
Same author

Ferroptosis: a potential target for acute lung injury.

Inflammation research : official journal of the European Histamine Research Society ... [et al.]·2024
Same author

Acute lung injury: a view from the perspective of necroptosis.

Inflammation research : official journal of the European Histamine Research Society ... [et al.]·2024

Related Experiment Video

Updated: Feb 19, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

12.7K

Sodium guide star laser pulsed at Larmor frequency.

Xuezong Yang, Lei Zhang, Shuzhen Cui

    Optics Letters
    |November 1, 2017
    PubMed
    Summary

    Researchers developed a novel high-power pulsed 589 nm laser for remote magnetometry. This laser technology enhances sodium guide star brightness, crucial for geomagnetic field measurements.

    Area of Science:

    • Optics and Photonics
    • Laser Technology
    • Geophysics

    Background:

    • Pulsed 589 nm lasers are essential for increasing sodium guide star brightness.
    • These lasers are critical for remote magnetometry utilizing mesospheric sodium.
    • Existing methods for generating such lasers face limitations.

    Purpose of the Study:

    • To develop a novel method for generating high-power pulsed 589 nm lasers at Larmor frequency.
    • To demonstrate the first-time achievement of this laser output for applications in remote magnetometry.
    • To optimize laser parameters for effective geomagnetic field measurements.

    Main Methods:

    • Amplification of a continuous-wave single-frequency 1178 nm laser using a pulse-pumped Raman fiber amplifier.
    • Frequency doubling of the amplified laser in an external cavity to achieve 589 nm output.

    More Related Videos

    Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
    08:48

    Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

    Published on: November 22, 2019

    8.1K
    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

    7.9K

    Related Experiment Videos

    Last Updated: Feb 19, 2026

    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
    09:38

    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

    Published on: December 18, 2015

    12.7K
    Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
    08:48

    Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

    Published on: November 22, 2019

    8.1K
    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

    7.9K
  • Utilizing a 1120 nm Raman pump laser with adjustable pulse repetition rate and duty cycle.
  • Implementing active pulse shaping to mitigate relaxation spikes.

    • Main Results:

    • Successfully generated a high-power pulsed 589 nm laser at Larmor frequency for the first time.
    • Demonstrated a 589 nm laser output pulsed at 350 kHz with a 20% duty cycle.
    • Achieved an average output power of up to 17 W, suitable for measuring a 0.5 G geomagnetic field.
    • Observed reduced pulse width and conversion efficiency in backwardly pumped Raman amplifier due to pump pulse transition effects.

    Conclusions:

    • The developed technique provides a viable method for producing high-power pulsed 589 nm lasers.
    • This laser system is a significant advancement for remote magnetometry and sodium guide star applications.
    • The demonstrated performance indicates potential for precise geomagnetic field measurements.