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

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 $5p^6\to 5p^{5}8s{}^2[3/2{]}_1$ transition at 110 nm in ${}^{132}$Xe. We improve its relative accuracy $10^4$ times to a value of $2.3\times 10^{-10}$. This is 3.6 times better than shown before involving HHG, and promising to enable $1S-2S$ spectroscopy of He${}^{+}$ for fundamental tests.

References in corpus (19)

• Phase-Matched Generation of Coherent Soft-X-Rays
• Direct Frequency Comb Spectroscopy in the Extreme Ultraviolet
• Improved Measurement of the Hydrogen 1S - 2S Transition Frequency
• Phase matching of high harmonic generation in the soft and hard X-ray regions of the spectrum
• Precision physics of simple atoms: QED tests, nuclear structure and fundamental constants
• Muonic hydrogen and the proton radius puzzle
• Highly charged ions: optical clocks and applications in fundamental physics
• New measurement of the $1S-3S$ transition frequency of hydrogen: contribution to the proton charge radius puzzle
• Direct detection of the 229Th nuclear clock transition
• Extreme ultraviolet frequency comb metrology
• Probing QED and fundamental constants through laser spectroscopy of vibrational transitions in HD+
• Extreme Ultraviolet Radiation With Coherence Time Greater Than 1 s
• Benchmarking theory with an improved measurement of the ionization and dissociation energies of H${}_2$
• Ramsey-comb spectroscopy with intense ultrashort laser pulses
• A laser excitation scheme for ${}^{229\text{m}}$Th
• Theory of the Lamb shift and Fine Structure in muonic ${}^4\mathrm{He}$ ions and the muonic ${}^3\mathrm{He}{-}^4\mathrm{He}$ Isotope Shift
• Atom interferometry based on light pulses : application to the high precision measurement of the ratio h/m and the determination of the fine structure constant
• Theory of the n=2 levels in muonic helium-3 ions
• Experiments towards resolving the proton charge radius puzzle

Cited by in corpus (8)

• Frequency ratio of the ${}^{229\mathrm{m}}$Th nuclear isomeric transition and the ${}^{87}$Sr atomic clock
• Broadband ultraviolet-visible frequency combs from cascaded high-harmonic generation in quasi-phase-matched waveguides
• XUV frequency comb operation in an astigmatism-compensated enhancement cavity
• A low repetition rate optical frequency comb
• Interrogating the temporal coherence of EUV frequency combs with highly charged ions
• An atom interferometer driven by a picosecond frequency comb
• Demonstration of Ramsey-Comb Precision Spectroscopy in Xenon at Vacuum Ultraviolet Wavelengths Produced with High-Harmonic Generation
• Intensity-dependent precision two-photon Doppler-free spectroscopy of Xe using narrow-bandwidth long-pulse deep-UV laser radiation