Fraunhofer diffraction
E23693
Fraunhofer diffraction is the far-field diffraction pattern of waves, typically light, observed when both the source and observation screen are effectively at infinite distance or made so with lenses, producing characteristic interference patterns.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Fraunhofer diffraction canonical | 6 |
| Fraunhofer diffraction formula | 1 |
| Fraunhofer diffraction theory | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T185487 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Fraunhofer diffraction Context triple: [Huygens–Fresnel principle, explains, Fraunhofer diffraction]
-
A.
Huygens–Fresnel principle
The Huygens–Fresnel principle is a fundamental concept in wave optics that explains how every point on a wavefront acts as a source of secondary wavelets whose interference determines the wave’s subsequent propagation and diffraction.
-
B.
Poisson spot
Poisson spot is a bright point of light that appears at the center of the shadow of a circular object due to wave diffraction, providing striking evidence for the wave nature of light.
-
C.
Newtonian optics
Newtonian optics is the branch of physics developed by Isaac Newton that explains light primarily as a stream of particles to account for reflection, refraction, and color phenomena.
-
D.
Hanbury Brown and Twiss effect
The Hanbury Brown and Twiss effect is a quantum optical phenomenon in which correlations in the arrival times of identical particles, such as photons, reveal their underlying statistical and coherence properties.
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E.
Cassegrain focus
Cassegrain focus is a telescope optical configuration in which light is reflected by a secondary mirror back through a hole in the primary mirror to form a compact, accessible focal point behind the primary.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Fraunhofer diffraction Target entity description: Fraunhofer diffraction is the far-field diffraction pattern of waves, typically light, observed when both the source and observation screen are effectively at infinite distance or made so with lenses, producing characteristic interference patterns.
-
A.
Huygens–Fresnel principle
The Huygens–Fresnel principle is a fundamental concept in wave optics that explains how every point on a wavefront acts as a source of secondary wavelets whose interference determines the wave’s subsequent propagation and diffraction.
-
B.
Poisson spot
Poisson spot is a bright point of light that appears at the center of the shadow of a circular object due to wave diffraction, providing striking evidence for the wave nature of light.
-
C.
Newtonian optics
Newtonian optics is the branch of physics developed by Isaac Newton that explains light primarily as a stream of particles to account for reflection, refraction, and color phenomena.
-
D.
Hanbury Brown and Twiss effect
The Hanbury Brown and Twiss effect is a quantum optical phenomenon in which correlations in the arrival times of identical particles, such as photons, reveal their underlying statistical and coherence properties.
-
E.
Cassegrain focus
Cassegrain focus is a telescope optical configuration in which light is reflected by a secondary mirror back through a hole in the primary mirror to form a compact, accessible focal point behind the primary.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
diffraction phenomenon
ⓘ
optics concept ⓘ |
| appliesTo |
acoustic waves
ⓘ
electromagnetic waves ⓘ light waves ⓘ matter waves ⓘ |
| assumes |
coherent illumination
ⓘ
paraxial approximation ⓘ small-angle approximation ⓘ |
| canBeObservedWith | laser light ⓘ |
| canBeRealizedWith |
collimating lens
ⓘ
focusing lens ⓘ |
| characterizedBy |
far-field approximation
ⓘ
plane wave approximation at aperture ⓘ plane wave approximation at observation screen ⓘ |
| contrastsWith | Fresnel diffraction ⓘ |
| dependsOn |
aperture shape
ⓘ
aperture size ⓘ wavelength of the wave ⓘ |
| determines | diffraction-limited resolution ⓘ |
| field |
physical optics
ⓘ
wave optics ⓘ |
| governedBy |
Huygens–Fresnel principle
ⓘ
scalar diffraction theory ⓘ |
| historicallyDevelopedIn | 19th century ⓘ |
| intensityProportionalTo | square of Fourier transform magnitude of aperture ⓘ |
| isA | far-field diffraction ⓘ |
| mathematicallyDescribedBy |
Fourier optics
ⓘ
Fourier transform of aperture function ⓘ |
| namedAfter | Joseph von Fraunhofer ⓘ |
| produces |
Airy pattern for circular aperture
ⓘ
diffraction orders for gratings ⓘ sinc-squared intensity pattern for single slit ⓘ |
| relatedTo |
Rayleigh criterion
ⓘ
optical transfer function ⓘ point spread function ⓘ |
| requires |
observation screen at effectively infinite distance
ⓘ
source at effectively infinite distance ⓘ |
| resultsIn |
far-field diffraction pattern
ⓘ
interference pattern ⓘ |
| usedIn |
diffraction grating analysis
ⓘ
microscope resolution analysis ⓘ optical imaging theory ⓘ spectroscopy ⓘ telescope resolution analysis ⓘ |
| usedToExplain | spectral line dispersion by gratings ⓘ |
| validWhen |
Fresnel number is much less than 1
ⓘ
aperture-to-screen distance is large compared to aperture size squared over wavelength ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Fraunhofer diffraction Description of subject: Fraunhofer diffraction is the far-field diffraction pattern of waves, typically light, observed when both the source and observation screen are effectively at infinite distance or made so with lenses, producing characteristic interference patterns.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Fraunhofer diffraction theory
this entity surface form:
Fraunhofer diffraction formula