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Lecture 7

# Lecture 7 - Lecture 7 Lecture 7 Wave Front Aberration In a...

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Lecture 7 1 © Jeffrey Bokor, 2000, all rights reserved Lecture 7 Wave Front Aberration In a wave-optics picture, the thin lens is represented by phase delay. Which gives Gaussian imaging. Aberrations modify . A spherical lens only gives this in the parax- ial approximation. For a complex optical system, we can collect the effects of all the lenses and represent them as a phase delay in the exit pupil. Usually, we subtract the quadratic phase to find the aberration. The residual is called the wave front error; or wfe usually depends on the field coordinate. In other words, the aberrations can vary depending on where you are in the field of view. Expressed in this way, the primary aberrations are written as: Spherical aberration: Coma: Astigmatism: Field Curvature: Distortion: x, y  k x 2 y 2 + 2 ----------------- k x, y == x, y x 2 y 2 + 2 f –W x , y + = Aberration wfe x, y ideal wave front aberrated wavefront W(x,y)= A s 4 : is normalized radial coordinate in the pupil : image height h A c 3 h  cos A a 2 h 2 2 cos A d 2 h 2 A t h 3  cos

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Lecture 7 2 © Jeffrey Bokor, 2000, all rights reserved Monochromatic Aberrations: All of the preceding discussion refers to aberrations that do not depend on wavelength.
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Lecture 7 - Lecture 7 Lecture 7 Wave Front Aberration In a...

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