Enhanced extreme ultraviolet high-harmonic generation from chromium-doped magnesium oxide

V. E. Nefedova, S. Fröhlich, F. Navarrete, N. Tancogne-Dejean, D. Franz, A. Hamdou, S. Kaassamani, D. Gauthier, R. Nicolas, G. Jargot, M. Hanna, P. Georges, M. F. Ciappina, U. Thumm, W. Boutu, H. Merdji

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High-order harmonic generation (HHG) from crystals is emerging as a new ultrashort source of coherent extreme ultraviolet (XUV) light. Doping the crystal structure can offer a new way to control the source properties. Here, we present a study of HHG enhancement in the XUV spectral region from an ionic crystal, using dopant-induced vacancy defects, driven by a laser centered at a wavelength of 1.55 μm. Our numerical simulations based on solutions of the semiconductor Bloch equations and density-functional theory are supported by our experimental observations and demonstrate an increase in the XUV high harmonic yield from doped bulk magnesium oxide (MgO) compared to undoped MgO, even at a low defect concentration. The anisotropy of the harmonic emission as a function of the laser polarization shows that the pristine crystal's symmetry is preserved. Our study paves the way toward the control of HHG in solids with complex defects caused by transition-metal doping.
The authors thank M. Billon for technical support. We acknowledge support from the PETACom (Petahertz Optoelectronics Communication) FET Open H2020 Grant No. 829153, OPTOLogic (Optical Topologic Logic) FET Open H2020 Grant No. 899794, support from the French ANR through the grant PACHA (No. ANR-17-CE30-0008-01) and the labex PALM (No. ANR-10-LABX-0039-PALM), support the DGA RAPID grant “SWIM.” We acknowledge the financial support from the French ASTRE program through the “NanoLight” grant, the Spanish Ministry MINECO (National Plan 15 grant: FISICATEAMO No. FIS2016-79508-P, SEVERO OCHOA No. SEV-2015-0522, FPI), European Social Fund, Fundació Cellex, Fundació Mir-Puig, Generalitat de Catalunya (AGAUR Grant No. 2017 SGR 1341, CERCA/Program), ERC AdG NOQIA, EU FEDER, European Union Regional Development Fund-ERDF Operational Program of Catalonia 2014–2020 (Operation Code: IU16-011424), MINECO-EU QUANTERA MAQS [funded by The State Research Agency (AEI) No. PCI2019-111828-2/10.13039/501100011033], and the National Science Centre, Poland-Symfonia Grant No. 2016/20/W/ST4/00314. F.N. and U.T. acknowledge support from Air Force Office of Scientific Research under Award No. FA9550-17-1-0369 and NSF Grant No. 1802085 (theory for photoemission from surfaces). Any opinions, finding, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the United States Air Force. U.T. acknowledges partial support from the Chemical Sciences, Geosciences, and Biosciences Division, Office of Basic Energy Sciences, Office of Science, US Department of Energy under Award No. DEFG02-86ER13491. N.T.-D. thanks A. Rubio.
Original languageAmerican English
JournalApplied Physics Letters
StateE-pub ahead of print - 17 May 2021

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