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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...
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Modes of Standing Waves: II01:04

Modes of Standing Waves: II

The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end.
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...
¹H NMR: Long-Range Coupling01:27

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...

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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Published on: August 12, 2013

Two-beam high-order harmonics from solids: coupling mechanisms.

A Tarasevitch1, J Wieczorek, R Kohn

  • 1Fakultät für Physik, Universität Duisburg-Essen, Lotharstr. 1, 47048 Duisburg, Germany. alexander.tarasevitch@uni-due.de

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

This study measured high-order harmonic generation polarization from solids. Computer simulations revealed nonlinear plasma density modulation as the primary coupling mechanism in the nonrelativistic regime.

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Area of Science:

  • Physics
  • Plasma Physics
  • Nonlinear Optics

Background:

  • High-order harmonic generation (HHG) is a key process in nonlinear optics.
  • Understanding the coupling mechanisms in driver-probe HHG is crucial for controlling emitted radiation.
  • Previous studies have explored HHG from solids, but detailed analysis of polarization effects and coupling mechanisms is ongoing.

Purpose of the Study:

  • To measure the polarization of two-beam (driver-probe) high-order harmonic generation from solids.
  • To distinguish between different coupling mechanisms of the driver and probe beams.
  • To investigate the role of nonlinear plasma density modulation in the nonrelativistic regime.

Main Methods:

  • Experimental measurement of polarization in high-order harmonic generation.
  • Utilizing a two-beam (driver-probe) experimental setup.
  • Performing computer simulations to model the interaction and distinguish coupling mechanisms.

Main Results:

  • Successfully measured the polarization of driver-probe HHG from solids.
  • Distinguished two distinct coupling mechanisms between the driver and probe beams.
  • Identified nonlinear plasma density modulation as the dominant coupling mechanism in the nonrelativistic regime.
  • Observed differences in harmonic efficiencies and spectral slopes corresponding to the identified coupling mechanisms.

Conclusions:

  • The coupling mechanisms in driver-probe HHG from solids can be differentiated by their polarization properties.
  • Nonlinear plasma density modulation is a key factor influencing HHG in the nonrelativistic regime.
  • These findings provide insights into controlling HHG for potential applications in attosecond science and spectroscopy.