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THz time-domain reflection spectroscopy of KTiOPO4
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.ORCID iD: 0000-0003-4037-0164
Division of Atomic Physics at the Faculty of Engineering (LTH), Lund University.
Department of Physics, Norwegian University of Science and Technology, Trondheim.ORCID iD: 0000-0002-5364-6740
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.ORCID iD: 0000-0003-2070-9167
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2019 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

There is an ongoing development of THz sources for high-field applications, especially with the view of potential for THz-driven particle accelerators. For such sources nonlinear materials with high optical damage threshold and low loss are required. KTiOPO4, (KTP) is a well-established material for nonlinear optical applications in the visible and near-IR region thanks to its large transparency, high nonlinear coefficient and damage threshold. Its reasonably low absorption [1, 2] and strong coupling to phonon-polariton degree of freedom [1]. This shows promise for efficient IR to THz conversionprocess. Indeed,Wu et al.[2] recently demonstrated its superiority to LiNbO3and LiTaO3in a back to back experiment. In view of this, it is important to determinethe spectrum of complex refractive index over larger spectral range and with higher accuracy than has been do so far. KTP is an orthorhombic crystal belonging to mm2 point group with a rather complex vibrational mode structure containing 192 degrees of freedom. Earlier spectroscopic studies of KTP have either lacked the possibility of directly extracting the complex refractive index [3] or been limited by absorption of the transmitted signal due to the strong resonances of KTP, limiting the spectral extenttoabout 2.5 THz [4]. In this work we utilize reflection THz time-domain spectroscopy (TTDS) to determine the spectrum of the refractive index, n, and the absorption coefficient, , between 0.5 THz and up to 7 THz for two eigenpolarizations on the (001) plane.

Place, publisher, year, edition, pages
Kista, Stockholm at Electrum: KTH , 2019.
Series
Poster Presentations ; 13
National Category
Atom and Molecular Physics and Optics
Research subject
Physics, Optics and Photonics
Identifiers
URN: urn:nbn:se:kth:diva-265574OAI: oai:DiVA.org:kth-265574DiVA, id: diva2:1379156
Conference
Optics & Photonics in Sweden conference 2019, Electrum, Kista, Sweden, 16-17 October 2019
Funder
Knut and Alice Wallenberg Foundation, 501100004063
Note

QC 20191217

Available from: 2019-12-16 Created: 2019-12-16 Last updated: 2019-12-17Bibliographically approved

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