2015/09/03 by Lukas Bruder, Marcel Binz, F. Stienkemeier +1 · 2 citations
Chemistry · Physics and Astronomy · #Atomic physics #Femtosecond #Helium #Laser #Laser-Matter Interactions and Applications #Modulation (music) #Observable #Optics #Photon #Physics #Potassium #Quantum #Quantum mechanics #Rubidium #Spectroscopy #Spectroscopy and Laser Applications #Spectroscopy and Quantum Chemical Studies #physics.atom-ph
paper · pdf · doi:10.1103/physreva.92.053412
arxiv created 2015/09/03 · openalex publication_date 2015/11/09 · openalex created_date 2016/06/24 · arxiv updated 2017/02/28 · openalex updated_date 2026/08/05
A phase modulation technique to sensitively and selectively isolate multiple-quantum coherences in a femtosecond pump-probe setup is presented. By detecting incoherent observables and incorporating lock-in amplification, even weak signals of highly dilute samples can be acquired. Applying this method, efficient isolation of one- and two-photon quantum beats in a rubidium-doped helium droplet beam experiment is demonstrated and collective resonances are observed in a potassium vapor for the first time up to fourth order. Our approach provides promising perspectives for coherent time-resolved experiments in the deep UV and multidimensional spectroscopy schemes, in particular when mass-selective detection of particles in dilute gas-phase targets is possible.