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Related Concept Videos

Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
Interference and Superposition of Waves01:07

Interference 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 and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Sound Waves: Interference00:53

Sound 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...
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,...
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...

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

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Published on: January 28, 2019

Interference in phase space.

Roman Castañeda1, Rafael Betancur, John F Restrepo

  • 1Physics School, Universidad Nacional de Colombia, Sede Medellín A.A., Medellín, Colombia. rcastane@unalmed.edu.co

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|October 3, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces a new phase-space method for analyzing interference patterns. This approach enhances understanding and expands applications of spatial coherence modulation in optics.

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Area of Science:

  • Optics and Photonics
  • Wave Phenomena
  • Quantum Optics

Background:

  • Interference is a fundamental wave phenomenon.
  • Spatial coherence modulation offers advanced control over optical fields.
  • Existing methods for interference analysis have limitations.

Purpose of the Study:

  • To present a novel phase-space representation of interference.
  • To leverage spatial coherence modulation for new interference insights.
  • To expand the applications of interference phenomena.

Main Methods:

  • Utilizing the marginal power spectrum for phase-space analysis.
  • Introducing carrier and (0,pi)-rays for interference description.
  • Modeling interference as the sum of radiant and modulating energies.

Main Results:

  • The phase-space representation provides new insights into interference.
  • The method successfully describes interference using carrier and (0,pi)-rays.
  • Numerical examples validate the proposed approach.

Conclusions:

  • The phase-space representation offers a powerful tool for studying interference.
  • Spatial coherence modulation principles can be effectively applied to interference.
  • This work opens avenues for novel applications in optical systems.