文档介绍：Aberration Theory
Geunyoung Yoon, .
Assistant Professor
Department of Ophthalmology
Center for Visual Science
University of Rochester
Optics
Quantum Optics
Coherent Optics
Diffractive Optics
(Fourier Optics)
Geometrical Optics
(Aberration theory)
Paraxial Optics
(First Order Optics)
(Gaussian Optics)
Outline
What Is Wavefront?
Huygens’s principle, Snell’s law, Fermat’s principle
Paraxial (first order) approximation
What Kind Of Wavefront Aberrations Are There?
Monochromatic aberration (Seidel and wave aberrations)
Chromatic aberration (Longitudinal, Transverse)
Why Are These Aberrations Important?
Relationship between aberrations and image quality
(Pupil function, PSF, MTF, Image convolution…)
How Can We Measure These Aberrations Of The Eye?
Different types of wavefront sensors
What Is Wavefront?
Huygens’s principle
Snell’s law
Fermat’s principle
Paraxial (first order) approximation
Wavefront vs Ray
“A wavefront is a surface over which an optical disturbance has a constant phase.”
Harmonic wave function ψ(x,t) = Asin(kx −ωt)
Phase
Spherical wavefront
Plane wavefront
x x
x x
t=0 t
Wavefront vs Ray
“Rays are lines normal to the wavefronts at every point of intersection.”
Plane wavefront Spherical wavefront
Ray
Huygens’s Principle
“Every point on a primary wavefront serves as the source of spherical secondary
wavelets, such that the primary wavefront at some later time is the envelope of
these wavelets.”
Secondary
spherical wavefront
Primary
spherical wavefront