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Nonlinear optics

Twisted high-harmonic generation

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Crossing two focused laser beams with opposite circular polarization makes the production and application of circularly polarized light in the extreme ultraviolet and soft X-ray spectral regions considerably easier and more efficient.

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Figure 1: Three-step model of high-harmonic generation with linear polarization in a gas, and the nonlinear geometry to generate circularly polarized light.

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Correspondence to Kjeld S. E. Eikema.

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Eikema, K. Twisted high-harmonic generation. Nature Photon 9, 710–712 (2015). https://doi.org/10.1038/nphoton.2015.204

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