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Doppler-free Fourier transform spectroscopy
Samuel A. Meek, Arthur Hipke, Guy Guelachvili +2
The feasibility of sub-Doppler broadband multi-heterodyne spectroscopy with two laser frequency combs is demonstrated with two-photon excitation spectra of the 5S-5D transitions of…
The proton radius puzzle
J. J. Krauth, K. Schuhmann, M. Abdou Ahmed +49
High-precision measurements of the proton radius from laser spectroscopy of muonic hydrogen demonstrated up to six standard deviations smaller values than obtained from electron-pr…
A phase-stable dual-comb interferometer
Zaijun Chen, Ming Yan, Theodor W. Hänsch +1
Improvements to dual-comb interferometers will benefit precision spectroscopy and sensing, distance metrology, tomography, telecommunications etc. A specific requirement of such in…
Ultrafocused Electromagnetic Field Pulses with a Hollow Cylindrical Waveguide
P. Maurer, J. Prat-Camps, J. I. Cirac +2
We theoretically show that an externally driven dipole placed inside a cylindrical hollow waveguide can generate a train of ultrashort and ultrafocused electromagnetic pulses. The…