Diffraction: Difference between revisions
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===Fresnel diffraction=== | ===Fresnel diffraction=== | ||
{{main | Wikipedia: Fresnel diffraction}} | {{main | Wikipedia: Fresnel diffraction}} | ||
Fresnel diffraction can be used for intermediate distances. | Fresnel diffraction can be used for intermediate distances (near-field), when <math>F = \frac{a^2}{L \lambda} \geq 1</math>. | ||
The Fresnel approximation is: | The Fresnel approximation is: | ||
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===Fraunhofer diffraction=== | ===Fraunhofer diffraction=== | ||
{{main | Wikipedia: Fraunhofer diffraction}} | {{main | Wikipedia: Fraunhofer diffraction}} | ||
Fraunhofer diffraction is used for far-field holograms. | Fraunhofer diffraction is used for far-field holograms, when <math>F = \frac{a^2}{L \lambda} << 1</math>. | ||
==Resources== | ==Resources== | ||
* Digital holography and wavefront sensing by Ulf Schnars, Claas Falldorf, John Watson, and Werner Jüptner, Springer-verlag Berlin an, 2016 | * Digital holography and wavefront sensing by Ulf Schnars, Claas Falldorf, John Watson, and Werner Jüptner, Springer-verlag Berlin an, 2016 | ||
** See https://github.com/OptoManishK/Digital_Holography | ** See https://github.com/OptoManishK/Digital_Holography | ||