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An aspherical geodesic lens havingf = 4.5mm andf/number = 0.64 has been built and tested for use in integrated optics. Its capability to carry out the spectral analysis of a signal is discussed. This lens is a member of a family of theoretically perfect geodesic lenses, characterized by an arbitrary choice of two parameters. This allows one to match the properties of a lens to the particular application one has in mind.
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Righini et al. (1979) studied this question.
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