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Trubetskov, M.; Amotchkina, T.; Lehnert, L.; Sancho-Parramon, J.; Golyari, K.; Janicki, V.; Ossiander, M.; Schultze, M.; Pervak, V. (2020): Broadband phase-shifting mirrors for ultrafast lasers. In: Applied Optics, Vol. 59, No. 5: A123-A127
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Metal-dielectric phase-shifting multilayer optical elements have been developed, providing broadband, virtually dispersion-free polarization manipulation down to the few-cycle level. These optical elements are Ag = Al2O3 mirrors that operate in the spectral range from 500 to 100 nm, exhibiting reflectance higher than 95%, and a differential phase shift between the s- and p-polarization of about 90 degrees distributed over four bounces. The mirrors have been designed, produced, and reliably characterized based on spectral photometric and ellipsometric data using a non-parametric approach as well as a multi-oscillator model. The optical elements were implemented into a few-cycle laser system, where they transformedlinearly polarized few-cycle light pulses to circular polarization. (C) 2019 Optical Society of America