Fresnelbased

Fresnelbased is a term used in optics and photonics to describe methods, models, or systems whose operation or analysis relies on the Fresnel diffraction framework and the Fresnel approximation. The term derives from Augustin-Jean Fresnel, who formalized near-field diffraction phenomena that lie between geometric optics and Fraunhofer diffraction. In practice, Fresnelbased approaches model the propagation of an optical field by applying a quadratic phase factor or by evaluating a Fresnel integral, providing a computationally efficient bridge between near-field and far-field regimes. In computational imaging, laser beam shaping, and diffractive optics, Fresnelbased methods are used to simulate or design how light propagates over short to moderate distances, for example in lens design, holography, and wavefront sensing. They are generally faster than exact integral solutions, and more accurate than simple far-field approximations in many near-field situations. Limitations include reduced accuracy at very large propagation distances, wide-angle propagation, or broadband illumination where spectral effects become important. The term is informal; many authors describe the same mathematics under the banner of Fresnel diffraction or the Fresnel approximation. See also Fresnel diffraction, Fresnel integrals, Fraunhofer diffraction.