Abstract
Any arbitrary generalized gradient-index interference coating (including homogeneous and inhomogeneous layers) possesses a digital configuration (sequence of thin high- or low-index layers), which is spectrally equivalent at all wavelengths. Such digital configurations are found directly from arbitrary-index profiles by using a prescribed two-layer high-low equivalent to a thin layer of arbitrary index. Digital configurations may be designed directly from given spectral requirements by using a flip-flop optimization scheme.
© 1985 Optical Society of America
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