A laser frequency comb is a broad spectrum composed of equidistant narrow lines. Initially
invented for frequency metrology, such combs enable new approaches to spectroscopy over …

The vast majority of gaseous chemical substances exhibit fundamental rovibrational
absorption bands in the mid-infrared spectral region (2.5–25 μm), and the absorption of light …

Polaritonic states arise when a bright optical transition of a molecular ensemble is
resonantly matched to an optical cavity mode frequency. Here, we lay the groundwork to …

Ultracold molecules offer unprecedented opportunities for the controlled interrogation of
molecular events, including chemical reactivity in the ultimate quantum regime. The …

The use of molecules in quantum optical applications has been hampered by incoherent
internal vibrations and other phononic interactions with their environment. Here we show …

Spectroscopy in the molecular fingerprint spectral region (6.7–20 µm) yields critical
information on material structure for physical, chemical, and biological sciences. Despite …

Probing matter with light in the mid-infrared provides unique insight into molecular
composition, structure, and function with high sensitivity. However, laser spectroscopy in this …

Substrate-transferred crystalline coatings have recently emerged as a groundbreaking new
concept in optical interference coatings. Building upon our initial demonstration of this …

State-selective enantiomeric excess is realized using microwave-driven coherent population
transfer. The method selectively promotes either R or S molecules to a higher rotational state …

Laser frequency combs emit a spectrum with hundreds of thousands of evenly spaced
phase-coherent narrow lines. A comb-enabled instrument, the dual-comb interferometer …