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Related Concept Videos

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,...
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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...
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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...
Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Interference and Decay01:16

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Forgetting is a complex cognitive phenomenon influenced by several factors, among which interference and decay are particularly prominent. These processes explain why individuals often struggle to retrieve specific information from memory, leading to lapses in recall that can be observed in everyday situations.
Interference occurs when competing memories hinder the retrieval of particular information. It can be classified into two types: proactive and retroactive interference. Proactive...

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Spatial interference: from coherent to incoherent.

Su-Heng Zhang1, Lu Gao, Jun Xiong

  • 1Department of Physics, Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing 100875, China.

Physical Review Letters
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

Optical interference patterns can form from spatially incoherent light sources, challenging conventional understanding. Statistical averaging of fluctuating waves reveals a well-defined pattern, similar to holography with coherent light.

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Area of Science:

  • Optics
  • Wave phenomena
  • Holography

Background:

  • Optical interference typically requires coherent light sources.
  • Spatially incoherent light sources are generally not expected to produce stable interference patterns.
  • Gabor's original holography proposal utilized coherent light.

Purpose of the Study:

  • To investigate the formation of optical interference patterns using spatially incoherent light.
  • To explore the applicability of holography principles with incoherent sources.
  • To challenge the conventional understanding of interference phenomena.

Main Methods:

  • An optical interference experiment was designed, closely resembling Gabor's holography setup.
  • A spatially incoherent light source was employed instead of a coherent one.
  • The statistical average of instantaneous interference patterns was analyzed.

Main Results:

  • A well-defined interference pattern was observed despite the use of an incoherent light source.
  • Instantaneous interference patterns fluctuated irregularly.
  • The statistically averaged pattern resembled a hologram formed with coherent light.

Conclusions:

  • Optical interference patterns can be generated from spatially incoherent light sources.
  • Holographic principles can be extended to incoherent light through statistical averaging.
  • This finding contradicts the common knowledge regarding the necessity of coherent light for interference.