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dc.contributor.advisorGoncharov, Alexander V.
dc.contributor.authorBahrami, Mehdi
dc.description.abstractThe variation of refractive index with wavelength, known as dispersion, was what redirected Isaac Newton from refractive telescope designs toward a reflective one, since he found the chromatic effect incurable. Later it was shown that different materials demonstrate different chromatic characteristics and refractive optical elements can compensate each other's chromatic contributions. This promoted the simple dispersion effect to the field of formulizing and categorizing chromatic aberrations and their corrections. In this study an introduction to this process is provided, where the historical aspects are followed by the mathematical derivation and description of different kinds of chromatic aberrations accompanied with a variety of approaches to correct the chromatic effects in different levels. The provided mathematical basis is employed in studying three distinctive topics. In the first one the flexibility of refractive elements is used to provide a middle-sized catadioptric telescope design with all-spherical surfaces. Employing a new combination of chromatic lens correctors, the image quality can be improved so that it becomes comparable to an equivalent aspheric Ritchey-Chrétien telescope design. As the second topic the atmospheric dispersion and its effect in extremely large telescopes are discussed, where a new atmospheric dispersion corrector design is proposed. In the third task the chromatic behavior in an inhomogeneous medium is considered. A new gradient refractive index lens model for the crystalline lens of the eye is established and a different approach in characterizing its chromatic effects is developed. These three research topics are underpinning the main goal of the theses, that is the role of chromatic aberration in image formation in various optical systems.en_US
dc.subjectChromatic Aberrationen_US
dc.subjectTelescope Designen_US
dc.subjectCatadioptric Systemen_US
dc.subjectAtmospheric Dispersionen_US
dc.subjectAtmospheric Dispersion Correctoren_US
dc.subjectModelling the Eyeen_US
dc.subjectGradient Index Lensen_US
dc.subjectCrystalline Lensen_US
dc.subjectExact Ray Tracingen_US
dc.subjectParaxial Opticsen_US
dc.subjectAberration Expansionsen_US
dc.titleChromatic Aberrations in Optical Systems: Prediction and Correctionen_US
dc.contributor.funderScience Foundation Ireland under grant number 07/IN.1/1906.en_US
dc.local.noteThe chromatic nature of the light can affect perfect imaging in refractive optical systems. This effect is studied for different optical systems and their surrounding environments to predict the magnitude of the image defects and to suggest correction approaches. The design of middle-sized telescopes with refractive elements is presented. Atmosphere chromatic effect is discussed and our novel chromatic correctors for future extremely large telescopes are examined. A new model of the lens of the eye is developed, and the predictions are compared to the chromatic measurements of the eye. This model also supports analytical optical calculations.en_US

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