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

Forced Oscillations01:06

Forced Oscillations

6.5K
When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
6.5K
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

2.2K
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
2.2K
Damped Oscillations01:07

Damped Oscillations

5.7K
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
5.7K
Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

85
Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
85
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

87
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
87
RLC Circuit as a Damped Oscillator01:30

RLC Circuit as a Damped Oscillator

887
An RLC circuit combines a resistor, inductor, and capacitor, connected in a series or parallel combination.
Consider a series RLC circuit. Here, the presence of resistance in the circuit leads to energy loss due to joule heating in the resistance. Therefore, the total electromagnetic energy in the circuit is no longer constant and decreases with time. Since the magnitude of charge, current, and potential difference continuously decreases, their oscillations are said to be damped. This is...
887

You might also read

Related Articles

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

Sort by
Same author

Discrete Time Crystals in Actively Mode-Locked Lasers.

Physical review letters·2026
Same author

Normal dispersion Kerr cavity solitons: beyond the mean-field limit.

Optics letters·2024
Same author

Square waves and Bykov T-points in a delay algebraic model for the Kerr-Gires-Tournois interferometer.

Chaos (Woodbury, N.Y.)·2023
Same author

Stationary broken parity states in active matter models.

Physical review. E·2023
Same author

Temporal localized states and square-waves in semiconductor micro-resonators with strong time-delayed feedback.

Chaos (Woodbury, N.Y.)·2023
Same author

Artificial optoelectronic spiking neuron based on a resonant tunnelling diode coupled to a vertical cavity surface emitting laser.

Nanophotonics (Berlin, Germany)·2023

Related Experiment Video

Updated: Jun 11, 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

11.4K

Pulse instabilities in harmonic active mode-locking: a time-delayed approach.

Elias R Koch, Svetlana V Gurevich, Julien Javaloyes

    Optics Letters
    |October 1, 2024
    PubMed
    Summary

    We developed a time-delayed model for active mode-locking, applicable to semiconductor lasers with high gain and losses. This model reveals complex dynamics and pulse behavior under varying conditions.

    More Related Videos

    Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
    07:42

    Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

    Published on: December 15, 2021

    3.0K
    Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators
    11:44

    Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators

    Published on: August 15, 2014

    10.3K

    Related Experiment Videos

    Last Updated: Jun 11, 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

    11.4K
    Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
    07:42

    Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

    Published on: December 15, 2021

    3.0K
    Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators
    11:44

    Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators

    Published on: August 15, 2014

    10.3K

    Area of Science:

    • Nonlinear dynamics
    • Laser physics
    • Optoelectronics

    Background:

    • Active mode-locking is crucial for generating ultrashort laser pulses.
    • Semiconductor lasers exhibit complex dynamics influenced by gain, losses, and linewidth enhancement factor.
    • Existing models may not fully capture behavior under high gain/loss conditions.

    Purpose of the Study:

    • To propose a robust time-delayed model for active mode-locking.
    • To analyze laser dynamics in regimes relevant to semiconductor lasers.
    • To investigate bifurcations and complex behaviors induced by the linewidth enhancement factor.

    Main Methods:

    • Development of a time-delayed model.
    • Extended bifurcation analysis.
    • Investigation of Hermite-Gauss solutions and stability.

    Main Results:

    • The model accurately represents semiconductor laser regimes with large round trip gain and losses.
    • Hermite-Gauss solutions are recovered near harmonic resonances and the lasing threshold.
    • The linewidth enhancement factor leads to complex dynamics and instability of the fundamental solution.
    • A global bifurcation scenario allows pulse transitions between modulation potential minima.

    Conclusions:

    • The time-delayed model provides a comprehensive framework for studying active mode-locking in semiconductor lasers.
    • Complex dynamics, including pulse instabilities and unique bifurcation scenarios, are revealed.
    • The findings offer insights into controlling and optimizing laser pulse generation.