Discover More: Angular-Spectrum-Dependent Interference

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Research Team Demonstrates 

Angular-Spectrum-Dependent 

Interference

Date Posted: 4th January 2022



Optical interference is not only a fundamental phenomenon that has brought about new theories of light but it has also been used in interferometry (a technique that uses the interference of superimposed waves to extract information).

The principle of superposition may be applied to waves whenever two (or more) waves travel through the same medium at the same time. The waves pass through each other without being disturbed. The net displacement of the medium at any point in space or time is simply the sum of the individual wave displacements.

Constructive interference is when two waves superimpose and the resulting wave has a higher amplitude than the previous waves. Destructive interference is when two waves superimpose and cancel each other out, leading to a lower amplitude.

The Michelson interferometer is a commonly used interferometer, by which the equal-inclination and equal-thickness interference fringes of light can be easily observed. 

In physics, fringes are bands of contrasting brightness or darkness produced by diffraction or interference of radiation with a measurable wavelength.

In a new paper published in Light Science & Application, a team of scientists has demonstrated a special equal-inclination interference by using non-monochromatic photons in a Michelson interferometer, manifested as the number of ring-like fringes increasing much more rapidly with increasing optical-path-difference (OPD: The relative path difference (or phase shift) travelled between two rays that pass through different mediums from the same object point. ) than the corresponding fringes for equal-inclination interference.

Source: Chinese Academy of Sciences

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