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Título
High-order Nonlinear Dipole Response Characterized by Extreme-Ultraviolet Ellipsometry
Autor(es)
Palabras clave
Attosecond pulses
Ellipsometry
Fundamental processes
High harmonic generation
Photon counting
Polarization control
Fecha de publicación
2020-11
Citación
K. Chang, L. Huang, K. Asaga, M. Tsai, L. Rego, P. Huang, H. Mashiko, K. Oguri, C. Hernández-García, and M. Chen, "High-order Nonlinear Dipole Response Characterized by Extreme-Ultraviolet Ellipsometry," in OSA High-brightness Sources and Light-driven Interactions Congress 2020 (EUVXRAY, HILAS, MICS), L. Assoufid, P. Naulleau, M. Couprie, T. Ishikawa, J. Rocca, C. Haefner, G. Sansone, T. Metzger, F. Quéré, M. Ebrahim-Zadeh, A. Helmy, F. Laurell, and G. Leo, eds., OSA Technical Digest (Optical Society of America, 2020), paper HF2B.5.
Resumen
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.
URI
DOI
10.1364/HILAS.2020.HF2B.5
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