Michael Trubetskov, OTF Studio GmbH, Garching, Germany and Max Planck Institute of Quantum Optics, Garching, Germany
Modern software packages in the field of multilayer optical coatings cover many classes of different problems, including analysis and synthesis of multilayers, characterization of monolayers, reverse-engineering of produced multilayer coatings, real-time control of deposition processes using broadband or quasi-monochromatic optical monitoring, and computer simulation of multilayer production. This wide coverage of various classes of problems is essential to achieve high-quality multilayer coatings, addressing new challenges in science and technology.
Various aspects of innovative software support are considered, including efficient ways to solve direct problems of multilayer coating evaluation involving vectorization and parallelization of computations. Efficient methods of solving synthesis problems are discussed, including classic and deep search needle synthesis, gradual evolution, and multi-start optimization. The choice and correct specification of targets—ranging from spectral and integral values, absorptance, and electric field to stress and thickness—are critical. For ultrafast optics, specialized targets include group delay (GD) and group delay dispersion (GDD), and multi-coating configurations for dispersive mirror compressors are involved.
Recent innovations integrate deep search methods able to provide solutions with excellent performance on the one hand and production-friendly tools, such as design cleaner, bound-trap, thick layer reduction, and robust synthesis.
Characterization determines optical parameters of substrates and layer materials, while reverse engineering identifies and compensates for repeatable production errors. Special adaptations support large area manufacturing in automotive, architectural, and wafer applications. Real-time characterization and re-optimization mitigate non-repeatable deposition errors.
Insights from recent Optical Interference Coatings (OIC) design challenges underscore the progress and creativity in tackling these complex problems, illustrating the interplay between theory, computation, and manufacturing realities in modern multilayer optical coating technology.