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Related Concept Videos

Phase Changes01:19

Phase 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...
Generation of Three-Phase Voltage01:21

Generation of Three-Phase Voltage

A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
As the rotor...
Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass filters, manage...
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time 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...
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time 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,...

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Updated: Jul 11, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Controlling the phase evolution of few-cycle light pulses

Apolonski1, Poppe, Tempea

  • 1Institut fur Photonik, Technische Universitat Wien, Gusshausstrasse 27, A-1040 Wien, Austria and Institute of Automation and Electrometry, SB RAS, Novosibirsk 630090, Russia.

Physical Review Letters
|September 16, 2000
PubMed
Summary
This summary is machine-generated.

Researchers measured carrier-envelope phase slip in 6-femtosecond light wave packets. This enables precise control over intense, few-cycle light pulses for advanced strong-field interactions and attosecond X-ray generation.

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Last Updated: Jul 11, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Published on: February 4, 2017

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Area of Science:

  • Quantum Optics
  • Ultrafast Laser Science
  • Attosecond Science

Background:

  • Precise control over light-matter interactions requires ultrashort light pulses.
  • Few-cycle laser pulses offer unique capabilities for probing and controlling electron dynamics.

Purpose of the Study:

  • To measure the carrier-envelope phase slip in 6-femtosecond light wave packets.
  • To enable the generation of intense, few-cycle light pulses with reproducible electric and magnetic fields.

Main Methods:

  • Utilized a coherent nonlinear optical technique.
  • Employed a mode-locked oscillator/pulse-compressor system to generate light wave packets.

Main Results:

  • Successfully measured the carrier-envelope phase slip.
  • Achieved generation of intense, few-cycle light with precisely reproducible fields.

Conclusions:

  • The generated pulses allow control over strong-field interactions on the optical cycle timescale.
  • These pulses are essential for reproducible attosecond X-ray pulse generation.