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Related Concept Videos

Modes of Standing Waves - I01:03

Modes of Standing Waves - I

A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This phenomenon...
Harmonic Mean01:09

Harmonic Mean

The arithmetic mean is usually skewed towards the larger values in the data set. Therefore, to avoid this inherent bias towards smaller values, the harmonic mean is used.
Take the example of the speed of a car, which is the measure of the rate of distance traveled. If the vehicle traverses the same distance back-and-forth, its average speed equals the total distance traveled divided by the total time taken. However, if the car moves with varying speeds, then the arithmetic mean is more skewed...
Simple Harmonic Motion01:21

Simple Harmonic Motion

Simple harmonic motion is the name given to oscillatory motion for a system where the net force can be described by Hooke's law. If the net force can be described by Hooke's law and there is no damping (by friction or other non-conservative forces), then a simple harmonic oscillator will oscillate with equal displacement on either side of the equilibrium position. To derive an equation for period and frequency, the equation of motion is used. The period of a simple harmonic oscillator is given...
Standing Waves01:17

Standing Waves

Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a refrigerator, which is one example of standing waves. Vibrations from the refrigerator motor create waves on the milk that oscillate up and down but do not seem to move across the surface. These waves are formed or created by the superposition of two or more identical moving waves in opposite directions. The waves move through each other, with their...
Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next sampling...
Phasor Arithmetics01:13

Phasor Arithmetics

Phasors and their corresponding sinusoids are interrelated, offering unique insights into the behavior of alternating current (AC) circuits. One way to understand this relationship is through the operations of differentiation and integration in both the time and phasor domains.
When the derivative of a sinusoid is taken in the time domain, it transforms into its corresponding phasor multiplied by j-omega (jω) in the phasor domain, where j is the imaginary unit, and ω is the angular frequency.

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Related Experiment Video

Updated: Jun 4, 2026

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

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Attochirp-free high-order harmonic generation.

Markus C Kohler1, Christoph H Keitel, Karen Z Hatsagortsyan

  • 1Max-Planck-Institut for Kernphysik, Heidelberg, Germany.

Optics Express
|March 4, 2011
PubMed
Summary

Researchers developed a new method for controlling high-order harmonic generation using shaped laser pulses. This technique enables the creation of bandwidth-limited attosecond pulses without needing chirp compensation filters.

Area of Science:

  • Quantum optics
  • Attosecond science
  • Laser-matter interactions

Background:

  • High-order harmonic generation (HHG) is a key process for producing extreme ultraviolet (XUV) and X-ray light.
  • Generating attosecond pulses with controlled phase is crucial for studying ultrafast dynamics.
  • Existing methods often require complex setups or filters for chirp compensation.

Purpose of the Study:

  • To propose a novel method for arbitrarily engineering the phase of high-order harmonic generation.
  • To demonstrate the generation of bandwidth-limited attosecond pulses.
  • To avoid the need for chirp compensation filters in attosecond pulse generation.

Main Methods:

  • Shaping the laser pulse by adding specific Fourier components to a sinusoidal field.

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Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels
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Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

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Last Updated: Jun 4, 2026

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

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels
08:32

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

Published on: January 28, 2022

  • Utilizing XUV light or X-rays for ionization.
  • Numerical simulations to verify the proposed method.

    • Main Results:

    • Arbitrary engineering of the HHG phase is achieved.
    • Generation of 8-attosecond (as) bandwidth-limited pulses is demonstrated from Li2+ gas.
    • The method is shown to be extendable to the zeptosecond (zs) scale.

    Conclusions:

    • The proposed method offers precise control over HHG phase.
    • It enables the generation of extremely short, bandwidth-limited attosecond pulses.
    • This technique has potential applications in attosecond and zeptosecond science.