2026-09-05T20:57:31Zhttps://gredos.usal.es/oai/request

oai:gredos.usal.es:10366/1470192025-04-30T20:35:17Zcom_10366_133237com_10366_4512com_10366_3823col_10366_133238

Chang, Kuang-Yu Huang, Long-Cheng Asaga, Koji Tsai, Ming-Shian Rego Cabezas, Laura Huang, Pei-Chi Mashiko, Hiroki Oguri, Katsuya Hernández García, Carlos Chen, Ming-Chang 2020-11 Polarization engineering and characterization of coherent high-frequency radiation are essential to investigate and control the symmetry properties of light–matter interaction phenomena at their most fundamental scales. This work demonstrates that polarization control and characterization of high-harmonic generation provides an excellent ellipsometry tool that can fully retrieve both the amplitude and phase of a strong-field-driven dipole response. The polarization control of high-harmonic generation is realized by a transient nonlinear dipole grating coherently induced by two noncollinear counterrotating laser fields.By adjusting the ellipticity of the two driving pulses simultaneously, the polarization state of every high-harmonic order can be tuned from linear to highly elliptical, and it is fully characterized through an energy-resolved extreme ultraviolet polarimeter. From the analysis of the polarization state, the ellipsometry indicated that both the amplitude and phase of the high-harmonic dipole scale rapidly with the driving laser field for higher-order harmonics, and, especially, for gases with a small ionization potential. Our experimental results were corroborated by theoretical simulations. Our findings revealed a novel high-harmonic ellipsometry technique that can be used for the next generation of high-harmonic spectroscopy and attosecond metrology studies because of its ability to provide single-digit attosecond accuracy.Our work also paves the way to precisely quantify the strong-field dynamics of fundamental processes associated with the transfer of energy and angular momentum between electron/spin systems and the symmetry-dependent properties of molecules and materials. application/pdf http://hdl.handle.net/10366/147019 spa High-order Nonlinear Dipole Response Characterized by Extreme-Ultraviolet Ellipsometry info:eu-repo/semantics/article TEXT Gredos. Repositorio Documental de la Universidad de Salamanca Hispana