Cornu spiral
Cornu spiral
"Cornu spiral" is a graphical presentation of the diffraction amplitude produced by Fresnel diffraction (Fresnel integral) on the complex plane (Gaussian plane) with the integration range (length from the source to the observation point) as a variable, resulting in a spiral shape. The diffraction intensity obtained by Fresnel diffraction is calculated as the square of the length of the line drawn from the start point (corresponding to the position of the source) to the end point (the observation point) of the Cornu spiral.
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