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Attosecond transient absorption spectroscopy of highly excited states allows investigating the dynamics of both the decay and the light induced coupling between excited states. We present a rigorous quantum mechanical treatment that provides a generalized discussion of the on- and off-resonant decay dynamics, of resonant and non-resonant couplings to either discrete or continua states and the temporal...
Ultra-rapid coherent Stokes and anti-Stokes Raman spectroscopy with two laser frequency combs is demonstrated. Spectra and hyperspectral images are measured over a span of 1200 cm−1 at 4 cm−1 resolution within 15 microseconds.
Nonlinear coherent Raman scattering with ultra-short pulse lasers has opened up new opportunities for nonintrusive three-dimensional label-free chemical sensing [1]. A single ultrashort pulse laser, combined to a pulse shaper or a Michelson interferometer (for a review, see [2]), allows for multiplex measurements. However, measuring a broad spectral bandwidth spectrum at high resolution within a very...
Ultra-rapid coherent anti-Stokes Raman spectroscopy with two laser frequency combs is demonstrated. Hyperspectral images are acquired over a spectral bandwidth of 1200 cm−1 with a resolution of 10 cm−1 at a rate of 50 pixels/s.
Nonlinear dual-frequency-comb spectroscopy is demonstrated with multi-heterodyne femtosecond Raman-induced Kerr-effect spectroscopy. Spectra of liquid samples are recorded with a spectral resolution of 200 GHz, a measurement time of 350 μs and a sensitivity of 10−6.
Peak intensities > 2×1013W/cm² are generated in a green enhancement cavity en route to XUV frequency comb generation with unprecedented conversion efficiencies. Enhancement limitations in the green region are discussed for the first time.
A resonator is presented, designed to overcome current power and intensity scaling limitations of HHG enhancement cavities and offering the prospect of MW circulating powers for ultrashort pulses. Suitable XUV output coupling mechanisms are addressed.
Spurengase kommen ihrer Definition nach in extrem geringen Konzentrationen vor. Dennoch spielen sie in vielen Bereichen eine große Rolle, so zum Beispiel in der Klimaforschung, der Luftanalyse oder zukünftig auch beim Studium der Atmosphären von extrasolaren Planeten. In einer Kooperation mit der Universität Tokio hat unser Forscherteam am Max‐Planck‐Institut für Quantenoptik (MPQ) in Garching ein...
Multipass cells offer a simple manner to enhance the sensitivity of dual-comb Fourier transform spectrometer. 1.5 µm spectra spanning 125 nm and exhibiting a noise-equivalent absorption coefficient of 4·10−9 cm−1Hz−½ are recorded within 63 µs.
Dual-comb Fourier transform spectroscopy with cavity enhancement holds much promise for trace gas sensing. Broadband high resolution spectra of ammonia around 1.0 µm are recorded within 18 µs and a noise-equivalent-absorption of 1 10−10 cm−1Hz−½.
A proof-of-principle experiment of mid-infrared frequency comb Fourier transform spectroscopy is carried out with two interfering Cr2+:ZnSe femtosecond oscillators, emitting around 2400 nm. Spectra of acetylene are measured within 10 μs with 12 GHz resolution.
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