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 …

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 …

Dual-comb spectroscopy is extended to the visible spectral range with two short-pulse
frequency-doubled free-running ytterbium-doped fiber lasers. When the spectrum is shifted
to other domains by nonlinear frequency conversion, tracking the relative fluctuations of the …

We report on the first (to our knowledge) demonstration of nonlinear dual-frequency-comb
spectroscopy. In multi-heterodyne femtosecond Raman-induced Kerr-effect spectroscopy,
the Raman gain resulting from the coherent excitation of molecular vibrations by a spectrally …

Fourier-transform spectroscopy is an indispensable tool for analyzing chemical samples in
scientific research as well as the chemical and pharmaceutical industries. Recently, its
measurement speed, sensitivity, and precision have been shown to be significantly …

Multiplex two-photon excitation spectroscopy is demonstrated at Doppler-limited resolution.
We describe first Fourier-transform two-photon spectroscopy of an atomic sample with two
mode-locked laser oscillators in a dual-comb technique. Each transition is uniquely …

A few‐cycle, broadband, singly‐resonant optical parametric oscillator (OPO) for the mid‐
infrared based on MgO‐doped periodically‐poled LiNbO3 (MgO: PPLN), synchronously
pumped by a 20‐fs Ti: sapphire laser is reported. By using crystal interaction lengths as …

A density-dependent loss of optically inactive paraexcitons is measured as a function of
temperature over a wide range of densities in Cu 2 O. At low temperatures, the two-body
inelastic collision rate stays at a constant and the extracted collision cross-section diverges …

By phase manipulation of a short laser pulse, it is possible to selectively generate ultracold
excitons in a two-photon process while quenching the multiphoton excitation of hot electrons
and holes. We show how this technique allows us to suppress the heating of n= 1 …