Nonlinear Diffuse fs-Pulse Reflectometry of Harmonic Upconversion Nanoparticles
Christian Kijatkin,
Juliane Eggert,
Sergej Bock,
Dirk Berben,
Laura Oláh,
Zsuzsanna Szaller,
Zsolt Kis,
Mirco Imlau
Affiliations
Christian Kijatkin
School of Physics, Osnabrueck University, Barbarastr. 7, 49076 Osnabrueck, Germany
Juliane Eggert
School of Physics, Osnabrueck University, Barbarastr. 7, 49076 Osnabrueck, Germany
Sergej Bock
School of Physics, Osnabrueck University, Barbarastr. 7, 49076 Osnabrueck, Germany
Dirk Berben
Department of Electrical Engineering and Information Technology, South Westphalia University of Applied Sciences, Haldener Str. 182, 58095 Hagen, Germany
Laura Oláh
Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, Konkoly-Thege u. 29-33, 1121 Budapest, Hungary
Zsuzsanna Szaller
Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, Konkoly-Thege u. 29-33, 1121 Budapest, Hungary
Zsolt Kis
Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, Konkoly-Thege u. 29-33, 1121 Budapest, Hungary
Mirco Imlau
School of Physics, Osnabrueck University, Barbarastr. 7, 49076 Osnabrueck, Germany
Nonlinear diffuse femtosecond-pulse reflectometry is introduced as a powerful experimental tool for the unambiguous characterization of polar and non-polar point symmetry groups of harmonic upconversion nanoparticles. Using intense ultrashort 40 femtosecond laser pulses and an appropriate figure of merit (FOM), second and third harmonic emission serve for the structural characterization of polar Yb-doped lithium niobate and non-polar titanium dioxide nanoparticles. The tool is capable of differentiating these two samples by FOM values that differ by up to 13 orders of magnitude. The general applicability to harmonic upconversion nanoparticles over a broad range of intensities and wavelength spectrum, is discussed.
