118 citations · 372 across the 8 of their papers we have counts for
8 papers
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…
A silicon single-crystal cryogenic optical resonator
Eugen Wiens, Qun-Feng Chen, Ingo Ernsting +4
We report on the demonstration and characterization of a silicon optical resonator for laser frequency stabilization, operating in the deep cryogenic regime at temperatures as low…
Robust frequency stabilization of multiple spectroscopy lasers with large and tunable offset frequencies
Alexander Nevsky, Soroosh Alighanbari, Qun-Feng Chen +7
We demonstrate a compact and robust device for simultaneous absolute frequency stabilization of three diode lasers whose carrier frequencies can be chosen freely relative to the re…
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…
Addressing and manipulation of individual hyperfine states in cold trapped molecular ions and application to HD^{+} frequency metrology
U. Bressel, A. Borodin, J. Shen +3
Advanced techniques for manipulation of internal states, standard in atomic physics, are demonstrated for a charged molecular species for the first time. We address individual hype…
Spectrally narrow, long-term stable optical frequency reference based on a Eu:YSiO crystal at cryogenic temperature
Qun-Feng Chen, Andrei Troshyn, Ingo Ernsting +4
Using an ultrastable continuous-wave laser at 580 nm we performed spectral hole burning of Eu:YSiO at very high spectral resolution. Essential parameters determi…