Journal
SCIENCE ADVANCES
Volume 8, Issue 5, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abj7380
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Funding
- Department of Energy BES Award [DE-FG02-99ER14982]
- Air Force Office of Scientific Research [FA9550-16-1-0121]
- National Science Foundation Physics Frontier Center [PHY-1734006]
- National Science Foundation Graduate Research Fellowships [DGE-1650115, DGE-1144083]
- Ministerio de Ciencia e Innovacion [FIS2016-75652-P, PID2019-106910GB-I00]
- European Research Council (ERC) under the European Union [851201]
- Junta de Castilla y Leon FEDER funds [SA287P18]
- Ministerio de Educacion, Cultura y Deporte [FPU16/02591]
- Ministerio de Ciencia, Innovacion, y Universidades for a Ramon y Cajal contract [RYC-2017-22745]
- European Social Fund [FI-2020-3-0013]
- European Research Council (ERC) [851201] Funding Source: European Research Council (ERC)
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In this study, a necklace-shaped phased array of HHG emitters has been formed, allowing for the control of line spacing and divergence properties in extreme ultraviolet and soft x-ray harmonic combs. The on-axis HHG emission exhibits extremely low divergence, providing a new degree of freedom for the design of harmonic combs, especially in the soft x-ray regime where options are limited.
The extreme nonlinear optical process of high-harmonic generation (HHG) makes it possible to map the properties of a laser beam onto a radiating electron wave function and, in turn, onto the emitted x-ray light. Bright HHG beams typically emerge from a longitudinal phased distribution of atomic-scale quantum antennae. Here, we form a transverse necklace-shaped phased array of linearly polarized HHG emitters, where orbital angular momentum conservation allows us to tune the line spacing and divergence properties of extreme ultraviolet and soft x-ray high-harmonic combs. The on-axis HHG emission has extremely low divergence, well below that obtained when using Gaussian driving beams, which further decreases with harmonic order. This work provides a new degree of freedom for the design of harmonic combs-particularly in the soft x-ray regime, where very limited options are available. Such harmonic beams can enable more sensitive probes of the fastest correlated charge and spin dynamics in molecules, nanoparticles, and materials.
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