Letter | Published:

Extreme-ultraviolet refractive optics

Naturevolume 564pages9194 (2018) | Download Citation

Abstract

Refraction is a well-known optical phenomenon that alters the direction of light waves propagating through matter. Microscopes, lenses and prisms based on refraction are indispensable tools for controlling light beams at visible, infrared, ultraviolet and X-ray wavelengths1. In the past few decades, a range of extreme-ultraviolet and soft-X-ray sources has been developed in laboratory environments2,3,4 and at large-scale facilities5,6. But the strong absorption of extreme-ultraviolet radiation in matter hinders the development of refractive lenses and prisms in this spectral region, for which reflective mirrors and diffractive Fresnel zone plates7 are instead used for focusing. Here we demonstrate control over the refraction of extreme-ultraviolet radiation by using a gas jet with a density gradient across the profile of the extreme-ultraviolet beam. We produce a gas-phase prism that leads to a frequency-dependent deflection of the beam. The strong deflection near to atomic resonances is further used to develop a deformable refractive lens for extreme-ultraviolet radiation, with low absorption and a focal length that can be tuned by varying the gas pressure. Our results open up a route towards the transfer of refraction-based techniques, which are well established in other spectral regions, to the extreme-ultraviolet domain.

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The data that support the findings of this study are available from the corresponding authors upon request.

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Acknowledgements

We thank A. A. Ünal and R. Schumann for their support with the laser systems. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie-Sklodowska-Curie grant agreement no. 641789 MEDEA.

Reviewer information

Nature thanks J. Cryan, M. Gaarde and the other anonymous reviewer(s) for their contribution to the peer review of this work.

Author information

Affiliations

  1. Max-Born-Institut, Berlin, Germany

    • L. Drescher
    • , O. Kornilov
    • , T. Witting
    • , G. Reitsma
    • , N. Monserud
    • , A. Rouzée
    • , J. Mikosch
    • , M. J. J. Vrakking
    •  & B. Schütte

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Contributions

L.D. and B.S. performed the prism experiments. B.S. performed the lens experiments. O.K. carried out the simulations. All authors discussed the results and contributed to writing the manuscript.

Competing interests

The authors declare no competing interests.

Corresponding authors

Correspondence to O. Kornilov or B. Schütte.

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DOI

https://doi.org/10.1038/s41586-018-0737-3

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