Related Experiment Video
Updated: May 18, 2026
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
The role of phase coherence in seeded supercontinuum generation
Simon Toft Sørensen1, Casper Larsen, Uffe Møller
1DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, 2800 Kgs Lyngby, Denmark. stso@fotonik.dtu.dk
Optics Express
|October 6, 2012
Summary
Controlling supercontinuum noise requires a nearly coherent seed pulse. Seed phase noise sensitivity dictates low-noise supercontinuum generation, with allowable seed linewidth decreasing as pump power increases.
Area of Science:
- Nonlinear optics
- Quantum optics
- Laser physics
Background:
- Supercontinuum generation is crucial for various applications, but its noise properties pose challenges.
- Modulating the pump laser with a seed pulse offers a method to control supercontinuum noise.
Purpose of the Study:
- To numerically investigate the impact of seeding on supercontinuum noise properties.
- To explore the influence of partially phase-coherent weak pulses or continuous waves as seeds.
Main Methods:
- Numerical simulations were employed to model supercontinuum generation.
- The study focused on varying the phase coherence and linewidth of the seed pulse.
Main Results:
- Supercontinuum noise is highly sensitive to the phase noise of the seed pulse.
- A nearly coherent seed pulse is essential for achieving coherent pulse breakup and low-noise supercontinuum.
- The maximum allowable linewidth of the seed laser decreases with increasing pump power.
Conclusions:
- Careful control over seed pulse coherence is critical for optimizing supercontinuum generation.
- These findings provide guidelines for selecting appropriate seed lasers for low-noise applications.
Related Concept Videos
01:24Time and frequency -Domain Interpretation of Phase-lead Control
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
01:26Phase Contrast and Differential Interference Contrast Microscopy
Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
01:19Phase Changes
Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
02:53Conservative Site-specific Recombination and Phase Variation
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
01:21Time and frequency -Domain Interpretation of Phase-lag Control
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 finite,...
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...
02:31Phase Transitions
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...