14.0 Field Curvature and Flattener

14.0 Field Curvature and Flattener - THE UNIVERSITY OF...

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FALL Semester 2010 THE UNIVERSITY OF CENTRAL FLORIDA OSE 6265 14.0 Field Curvature and Field Flattener James E. Harvey, Instructor 14.0
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14.1 Introduction In Section 7.3.5, two aberrations were introduced that affected the position of the point image without degrading its quality. They were field curvature (W 220 ) and distortion (W 311 ). In this chapter, we will study field curvature in more detail. We will see how ZEMAX determines both the wavefront aberration value as well as the radius of the corresponding curved image surface. This will be followed by a discussion on the design of the optic known as the “field flattener”. 14.1 Object Plane Gaussian Image Plane Petzval Surface Field curvature was described as a field-dependent longitudinal focal shift that varies as the square of the field angle. The wavefront emerging from the exit pupil is therefore spherical but focused upon a point removed along the chief ray from the Gaussian image plane. Hence, if one has a series of object points in a plane perpendicular to the optical axis, the emerging wavefronts are focused upon points lying on a spherical surface which touches the Gaussian image plane at the optical axis.
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Structural Aberration Coefficients III F u n D W σ ) 4 ( ) ( 2 1 # 2 222 = σ is the structural aberration coefficient, D is the diameter of the imaging element, n is the index of refraction in image space, and u is the image space field angle measured from the principle point. Spherical Aberration
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14.0 Field Curvature and Flattener - THE UNIVERSITY OF...

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