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In-Situ Nanoscale Focusing of Extreme Ultraviolet Solid-State High Harmonics
- Source :
- Physical Review X, Vol 12, Iss 4, p 041036 (2022)
- Publication Year :
- 2022
- Publisher :
- American Physical Society, 2022.
-
Abstract
- Extreme ultraviolet light delivering radiation with a wavelength shorter than approximately 100 nm is now available from solid-state sources. However, despite exceptional progress, efficient focusing of extreme ultraviolet photons to their ultimate diffraction limit remains a formidable challenge because of the precision of the focusing by curved, optical surfaces. Here we integrate coherent short-wavelength high-order harmonics from a MgO crystal, with a high-numerical-aperture, nanostructured, focusing element etched onto the surface of the crystal itself. We focus extreme ultraviolet light, seventh harmonic of an 800-nm laser, with a zone plate of numerical aperture 0.35, down to a waist radius of 150 nm, with 18% focusing efficiency. The estimated intensity approaches 10^{7} W/cm^{2}. Future developments may demonstrate nanoscale laser ablation and miniaturization of extreme ultraviolet coherent sources on a chip.
Details
- Language :
- English
- ISSN :
- 21603308
- Volume :
- 12
- Issue :
- 4
- Database :
- Directory of Open Access Journals
- Journal :
- Physical Review X
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.406cb62c5b5844d5b66cdf22d5e05fe9
- Document Type :
- article
- Full Text :
- https://doi.org/10.1103/PhysRevX.12.041036