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arXiv · 1911.08843

High-Precision Ramsey-Comb Spectroscopy Based on High-Harmonic Generation

L. S. Dreissen·C. Roth·E. L. Gründeman·J. J. Krauth·M. Favier·K. S. E. Eikema
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Abstract

High-harmonic generation (HHG) is widely used for up-conversion of amplified (near) infrared ultrafast laser pulses to short wavelengths. We demonstrate that Ramsey-comb spectroscopy, based on two such pulses derived from a frequency-comb laser, enables us to observe phase effects in this process with a few mrad precision. As a result, we could perform the most accurate spectroscopic measurement based on light from HHG, illustrated with a determination of the $5p^6 \rightarrow 5p^5 8s~^2[3/2]_1$ transition at 110 nm in $^{132}$Xe. We improve its relative accuracy $10^4$ times to a value of $2.3\times10^{-10}$. This is 3.6 times better than shown before involving HHG, and promising to enable $1S-2S$ spectroscopy of He$^+$ for fundamental tests.

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L. S. Dreissen, C. Roth, E. L. Gründeman, J. J. Krauth, M. Favier, K. S. E. Eikema. 2019-11-20. High-Precision Ramsey-Comb Spectroscopy Based on High-Harmonic Generation. https://doi.org/10.1103/physrevlett.123.143001

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