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Optimization strategy for low-phase-dispersion dielectric mirrors

The Damped Least Squares (DLS) optimization algorithm plays a useful role in the design of multilayer optical coatings. It does, however, require numerically well-behaved error terms and the convergence is highly dependent on the degree of non-linearity present in the error term chosen. This paper makes some recommendations for the choice of error terms for effective control of phase-dispersion in dielectric mirrors.