Efficient isolation of multiphoton processes and detection of collective resonances in dilute samples

@article{Bruder2015EfficientIO,
  title={Efficient isolation of multiphoton processes and detection of collective resonances in dilute samples},
  author={Lukas Bruder and Marcel Binz and Frank Stienkemeier},
  journal={Physical Review A},
  year={2015},
  volume={92},
  pages={053412}
}
A novel technique to sensitively and selectively isolate multiple-quantum coherences in a femtosecond pump-probe setup is presented. Detecting incoherent observables and imparting lock-in amplification, even weak signals of highly dilute samples can be acquired. Applying this method, efficient isolation of one- and two-photon transitions in a rubidium-doped helium droplet beam experiment is demonstrated and collective resonances up to fourth order are observed in a potassium vapor for the first… 

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