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- W3198971231 abstract "The effects of the dispersion in homogeneous glasson the quality of lenses are known. In many cases these colorrelated effects limit the performance of an optical lens. Gradientindex materials offer a means to improve the performance of a lensin both monochromatic and polychromatic applications. For thesematerials to be incorporated into a lens design, accurate knowledgeof the index of refraction profile and the dispersion of thegradient are necessary. Multiple wavelengtha.c. interferometry has been investigated as a method ofmeasurement to obtain both the index of refraction and thedispersion as a function of spatial coordinates. The theory formultiple wavelength a.c. interferometry has been developed.Computer programs have been written which predict the amplitude ofthe a.c. signal (a measure of the dispersion) and calculate thedispersion of the gradient from the amplitude of the a.c. signal. An a.c. Mach Zehnder interferometer has beenbuilt to measure the index of refraction profile and the chromaticdispersion of the gradient. Optical signals for single wavelengthand multiple wavelength irradiance patterns are obtainedsimultaneously to eliminate registration errors of the spatialcoordinates. The optical signals are processed electronically toyield the index of refraction profile and the amplitude of the a.c.signal. The system is interfaced to a computer to eliminateproblems associated with handling of data. Programs have beenwritten which yield the index of refraction at one wavelength andthe dispersion of the gradient as a function of spatialcoordinates. The measurements confirm thevalidity of the theory of multiple wavelength a.c. interferometryfor measuring the dispersion of gradient indexmaterials." @default.
- W3198971231 created "2021-09-27" @default.
- W3198971231 creator A5086389035 @default.
- W3198971231 date "2016-01-01" @default.
- W3198971231 modified "2023-09-23" @default.
- W3198971231 title "Measurement of the chromatic dispersion of gradient indexmaterials by multiple wavelength A.C. interferometry" @default.
- W3198971231 hasPublicationYear "2016" @default.
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