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Tabletop spectroscopic ellipsometry for probing optical properties in the extreme ultraviolet
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We demonstrate extreme-ultraviolet (EUV) spectroscopic ellipsometry (SE) using a tabletop high-harmonic generation (HHG) source for optical-constant determination. The polarization-resolved system enables accurate retrieval of the complex refractive index n-ik, as validated by measurements on a Nb2O5 film and by indirect determination of the optical constants of molybdenum and gold mirrors in the analyzer. This approach provides a compact and versatile platform for precise EUV optical-constant determination and future ultrafast studies.
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