118 citations · 391 across the 8 of their papers we have counts for
8 papers
Proton-electron mass ratio by high-resolution optical spectroscopy of ion ensembles in the resolved-carrier regime
I. V. Kortunov, S. Alighanbari, M. G. Hansen +3
Optical spectroscopy in the gas phase is a key tool to elucidate the structure of atoms and molecules and of their interaction with external fields. The line resolution is usually…
Characteristics of long-lived persistent spectral holes in at
René Oswald, Michael Hansen, Eugen Wiens +2
Properties of persistent spectral holes (SHs) relevant for frequency metrology have been investigated in the system (0.5%) at crystallographic site 1 and a t…
Characterization of the long-term dimensional stability of a NEXCERA block using the optical resonator technique
Chang Jian Kwong, Michael Georg Hansen, Jun Sugawara +1
NEXCERA is a machinable and highly polishable ceramic with attractive properties for use in precision instruments, in particular because its coefficient of thermal expansion exhibi…
Rotational spectroscopy of cold, trapped molecular ions in the Lamb-Dicke regime
Soroosh Alighanbari, Michael Georg Hansen, Vladimir Korobov +1
Sympathetic cooling of trapped ions has been established as a powerful technique for manipulation of non-laser-coolable ions (Raizen1992,Waki1992,Bowe1999,Barrett2003). For molecul…
A quantum cascade laser-based mid-IR frequency metrology system with ultra-narrow linewidth and -level frequency instability
Michael G. Hansen, Evangelos Magoulakis, Qun-Feng Chen +2
We demonstrate a powerful tool for high-resolution mid-IR spectroscopy and frequency metrology with quantum cascade lasers (QCLs). We have implemented frequency stabilization of a…
Robust, frequency-stable and accurate mid-IR laser spectrometer based on frequency comb metrology of quantum cascade lasers up-converted in orientation-patterned GaAs
Michael G. Hansen, Ingo Ernsting, Sergey V. Vasilyev +4
We demonstrate a robust and simple method for measurement, stabilization and tuning of the frequency of cw mid-infrared (MIR) lasers, in particular of quantum cascade lasers. The p…