This article reviews recent developments in tests of fundamental physics using atoms and
molecules, including the subjects of parity violation, searches for permanent electric dipole …

In many theories beyond the Standard Model the quantities that we call “fundamental
constants” become space‐time dependent, leading to corresponding variation of atomic and …

By reducing both the internal and translational temperature of any species down to a few
kelvins, the buffer-gas-cooling (BGC) technique has the potential to dramatically improve the …

Four-wave-mixing-based quantum cascade laser frequency combs (QCL-FC) are a powerful
photonic tool, driving a recent revolution in major molecular fingerprint regions, ie mid-and …

Selective pumping and probing of highly excited states of molecules are essential in various
studies but are also challenging because of high density of states, weak transition moments …

We demonstrate continuous-wave cavity ring-down spectroscopy of a partially
hydrodynamic molecular beam emerging from a buffer-gas-cooling source. Specifically, the …

We report on a narrow-linewidth distributed-feedback quantum cascade laser at 8.6 μm that
is optical-feedback locked to a high-finesse V-shaped cavity. The spectral purity of the …

We have designed, constructed, and commissioned a cryogenic helium buffer-gas source
for producing a cryogenically cooled molecular beam and evaluated the effect of different …

We stabilize the idler frequency of a singly resonant optical parametric oscillator directly to
the resonance of a mid-infrared Fabry–Perot reference cavity. This is accomplished by the …

We report on absolute measurements of saturated-absorption line-center frequencies of
room-temperature trifluoromethane using a quantum cascade laser at 8.6 μm and the …