Laser frequency combs are coherent light sources that emit a broad spectrum of discrete,
evenly spaced narrow lines whose absolute frequency can be measured to within the
accuracy of an atomic clock. Their development in the near-infrared and visible domains has …

The sensitivity of molecular fingerprinting is dramatically improved when the absorbing
sample is placed in a high-finesse optical cavity, because the effective path length is
increased. When the equidistant lines from a laser frequency comb are simultaneously …

Molecular fingerprinting using absorption spectroscopy is a powerful analytical method,
particularly in the infrared, the region of intense spectral signatures. Fourier transform
spectroscopy—the widely used and essential tool for broadband spectroscopy—enables the …

The mid-infrared spectral range (λ~ 2–20 μm) is of particular importance as many molecules
exhibit strong vibrational fingerprints in this region. Optical frequency combs—broadband
optical sources consisting of equally spaced and mutually coherent sharp lines—are …

Advances in optical spectroscopy and microscopy have had a profound impact throughout
the physical, chemical and biological sciences. One example is coherent Raman
spectroscopy, a versatile technique interrogating vibrational transitions in molecules. It offers …

The spectrum of a laser frequency comb consists of several hundred thousand equally
spaced lines over a broad spectral bandwidth. Such frequency combs have revolutionized
optical frequency metrology and they now hold much promise for significant advances in a …

The mid-infrared part of the electromagnetic spectrum is the so-called molecular fingerprint
region because gases have tell-tale absorption features associated with molecular
rovibrations. This region can be for instance exploited to detect small traces of …

Spectroscopic gas sensing and its applications to, for example, trace detection or chemical
kinetics, require ever more demanding measurement times, acquisition rates, sensitivities,
precisions and broad tuning ranges. Here, we propose a new approach to near-infrared …

Laser frequency combs, sources with a spectrum consisting of hundred thousands evenly
spaced narrow lines, have an exhilarating potential for new approaches to molecular
spectroscopy and sensing in the mid-infrared region. The generation of such broadband …

An ultrashort-pulse Cr^ 2+: ZnSe laser is a novel broadband source for sensitive high
resolution molecular spectroscopy. A 130-fs pulse allows covering of up to 380 cm^-1
spectral domain around 2.4 μm which is analyzed simultaneously with a 0.12 cm^-1 (3.6 …