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

Electromagnetic Wave Equation01:24

Electromagnetic Wave Equation

2.0K
Maxwell's equations for electromagnetic fields are related to source charges, either static or moving. These fields act on a test charge, whose trajectory can thus be determined using suitable boundary conditions. The objective of electromagnetism is thus theoretically complete.
However, although electric and magnetic fields were first introduced as mathematical constructs to simplify the description of mutual forces between charges, a natural question emerges from Maxwell's equations:...
2.0K
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

1.4K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.4K
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

2.6K
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,...
2.6K
Fermi Level Dynamics01:12

Fermi Level Dynamics

595
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
595
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

2.9K
An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
2.9K
The de Broglie Wavelength02:32

The de Broglie Wavelength

32.7K
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
32.7K

You might also read

Related Articles

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

Sort by
Same author

Atmospheric droplet detection and classification with self-mixing interferometry and neural networks.

Applied optics·2026
Same author

Experimental demonstration of coherent beam combination by a simulation-trained deep neural network.

Optics letters·2026
Same author

Amplifier enhanced gain-through-filtering instability in a hybrid Kerr cavity.

Optics express·2025
Same author

Solitons in ultrafast semiconductor lasers with saturable absorber.

Nanophotonics (Berlin, Germany)·2025
Same author

Mode-locking via delayed orthogonal-polarization reinjection in semiconductor VCSELs.

Optics letters·2025
Same author

Fast square-oscillations in semiconductor VCSELs with delayed orthogonal polarization feedback.

Optics express·2025
Same journal

PCSK5 promotes angiogenesis and cardiac repair after myocardial infarction.

Nature communications·2026
Same journal

PfApiAT2 is a proline transporter essential for the transmission of Plasmodium falciparum by the mosquito vector.

Nature communications·2026
Same journal

Transient distortions of the South Atlantic Anomaly radiation environments driven by electric fields.

Nature communications·2026
Same journal

Structural basis of the regulation by CDK11 kinase of early spliceosome activation and evidence for its proofreading by DHX15 helicase.

Nature communications·2026
Same journal

Structural and mechanistic insights into primer synthesis initiation by DNA primase.

Nature communications·2026
Same journal

Changes in heritability and shared environmentality of educational attainment across twentieth-century Norway.

Nature communications·2026
See all related articles

Related Experiment Video

Updated: Dec 30, 2025

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

11.8K

Coherent master equation for laser modelocking.

Auro M Perego1, Bruno Garbin2,3, François Gustave4

  • 1Aston Institute of Photonic Technologies, Aston University, Birmingham, B4 7ET, UK.

Nature Communications
|January 18, 2020
PubMed
Summary
This summary is machine-generated.

A new coherent master equation (CME) framework accurately models ultrashort-pulsed lasers, overcoming limitations of the traditional Haus master equation (ME) for fast dynamics and quantum coherence.

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

7.9K
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

7.8K

Related Experiment Videos

Last Updated: Dec 30, 2025

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

11.8K
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

7.9K
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

7.8K

Area of Science:

  • Physics
  • Quantum Optics
  • Laser Physics

Background:

  • Modelocked lasers are crucial for ultrashort-pulsed coherent radiation.
  • The standard Haus master equation (ME) fails for fast medium dynamics and relevant quantum coherence.
  • Accurate modeling is essential for advancing laser technology.

Purpose of the Study:

  • To develop a rigorous and general coherent master equation (CME) framework.
  • To overcome the limitations of the Haus ME in modeling laser dynamics.
  • To enable the description of quantum coherence effects in laser operation.

Main Methods:

  • Introduction of a novel coherent master equation (CME) framework.
  • Experimental validation using an amplitude-modulated semiconductor laser.
  • Analysis of coherent effects like the Risken-Nummedal-Graham-Haken instability.

Main Results:

  • The CME framework demonstrates strong deviations from the predictions of the Haus ME.
  • Experimental results confirm the predictions of the CME.
  • The CME successfully accounts for phenomena influenced by quantum coherence.

Conclusions:

  • The developed CME provides a more accurate and general description of modelocked lasers.
  • The CME is crucial for understanding self-modelocking and frequency comb formation in advanced lasers.
  • This formalism unlocks new possibilities for laser design by incorporating coherent effects.