GeomOpt_Part43

GeomOpt_Part43 - Department of Electrical and Computer...

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Department of Electrical and Computer Engineering ECSE 527 Optical Engineering hromatic Aberrations Chromatic Aberrations Reading: Hecht 6.3.2 Andrew Kirk 2010 Aberrations 63
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Overview Aberrations can also arise because the refractive index of glass is a function of wavelength. As a result, when the light source contains a range of avelengths, not all may be imaged perfectly. These wavelengths, not all may be imaged perfectly. These errors are called chromatic aberrations. In this class we will see the way in which chromatic aberrations re measured and techniques for correcting them are measured and techniques for correcting them. ©AGK 2010 Aberrations 64
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Contents • Origin of chromatic aberration • Dispersion curves and Abbe numbers • Design of achromatic lenses Residual chromatic aberration ©AGK 2010 Aberrations 65
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Learning outcomes After taking this section you will be able to: • Explain the basis of chromatic aberration • Design an achromatic doublet lens Choose an appropriate glass based on its Abbe number ©AGK 2010 Aberrations 66
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Refractive index of common optical materials* Dense flint glass tion 1.7 g ex of refrac t 1.6 Light flint glass Ind e 1.5 Crystal quartz Borosilicate crown glass 1.4 Acrylic plastic Vitreous quartz ©AGK 2010 Aberrations 67 Wavelength (nm) 0 200 400 600 800 1000 *From: Hecht, Optics (2nd Ed.) p. 62
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Chromatic aberration • Focal length is determined by refractive index • Glass is dispersive • Focal length is wavelength dependant ©AGK 2010 Aberrations 68
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Chromatic aberration • Focal length is determined by refractive index • Glass is dispersive • Focal length is wavelength dependant or positive lenses creases ith wavelength For positive lenses, f increases with wavelength ©AGK 2010 Aberrations 69
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Axial chromatic aberration ©AGK 2010 Aberrations 70
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Axial chromatic aberration A•CA F B F R LC A•CA : Axial (longitudinal) chromatic aberration ©AGK 2010 Aberrations 71
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Lateral Chromatic Aberration F B F R ©AGK 2010 Aberrations 72
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Lateral Chromatic Aberration F B F R red image L•CA blue image L•CA : Lateral chromatic aberration (lateral colour) ©AGK 2010 Aberrations 73 Also called transverse chromatic aberration (TCA)
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Example hoto by Paul Van Photo by Paul Van Walree ©AGK 2010 Aberrations 74 http://www.vanwalree.com/optics/chromatic.html
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Positive and negative lenses F B F R ©AGK 2010 Aberrations 75
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GeomOpt_Part43 - Department of Electrical and Computer...

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