Related Experiment Video
Updated: May 22, 2026
11:20
Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
Influence of surface waves on plasma high-order harmonic generation
Daniel an der Brügge1, Naveen Kumar, Alexander Pukhov
1Institut für theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany.
Physical Review Letters
|May 1, 2012
Summary
Surface plasma waves influence high-order harmonic generation in intense laser-plasma interactions. These waves shift harmonic emission off-axis and reduce on-axis intensity, revealing a novel generation process in the relativistic regime.
Area of Science:
- Plasma Physics
- Nonlinear Optics
- Laser-Plasma Interactions
Background:
- High-order harmonic generation (HHG) is a key process in nonlinear optics.
- Understanding HHG in overdense plasmas is crucial for applications like attosecond pulse generation.
- Surface plasma waves (SPWs) are known to influence laser-plasma interactions.
Purpose of the Study:
- To analyze the influence of SPWs on HHG from intense laser interactions with overdense plasma.
- To investigate the role of SPWs in experimental surface HHG.
- To identify novel SPW generation mechanisms in the relativistic regime.
Main Methods:
- Numerical simulations of intense laser-plasma interactions.
- Analysis of harmonic emission characteristics (spatial distribution and intensity).
- Investigation of SPW generation and propagation dynamics.
Main Results:
- SPWs cause off-axis emission of harmonics.
- SPWs reduce the intensity of on-axis high-order harmonics.
- A novel SPW generation process, distinct from two-surface wave decay, was observed in the highly relativistic regime.
Conclusions:
- SPW generation is critical for surface HHG experiments.
- The observed novel SPW generation mechanism offers new insights into relativistic laser-plasma dynamics.
- This study advances the understanding of HHG control and optimization in plasma environments.
Related Concept Videos
01:28Standing Waves in a Cavity
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
01:17Standing 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...
01:07Interference and Superposition of Waves
When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
00:53Sound Waves: Interference
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...
01:03Modes 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...
01:10Wave Parameters
The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...