Femtosecond time-resolved optical pump-probe spectroscopy at kilohertz-scan-rates over nanosecond-time-delays without mechanical delay line

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Applied Physics Letters ; 88 (2006), 4. - 41117
Abstract
We demonstrate a technique for femtosecond time-resolved optical pump-probe spectroscopy that allows to scan over a nanosecond time delay at a kilohertz scan rate without mechanical delay line. Two mode-locked femtosecond lasers with approximately 1 GHz repetition rate are linked at a fixed difference frequency of ΔfR=11 kHz. One laser delivers the pump pulses, the other provides the probe pulses. The relative time delay is linearly ramped between zero and the inverse laser repetition frequency at a rate ΔfR, enabling high-speed scanning over a 1 ns time delay. The advantages of this method for all-optical pump-probe experiments become evident in an observation of coherent acoustic phonons in a semiconductor superlattice via transient reflectivity changes. A detection shot-noise limited signal resolution of 7×10 8 is obtained with a total measurement time of 250 s. The time resolution is 230 fs.
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ISO 690BARTELS, Albrecht, Florian HUDERT, Christof JANKE, Thomas DEKORSY, Klaus KÖHLER, 2006. Femtosecond time-resolved optical pump-probe spectroscopy at kilohertz-scan-rates over nanosecond-time-delays without mechanical delay line. In: Applied Physics Letters. 88(4), 41117. Available under: doi: 10.1063/1.2167812
BibTex
@article{Bartels2006Femto-9495,
  year={2006},
  doi={10.1063/1.2167812},
  title={Femtosecond time-resolved optical pump-probe spectroscopy at kilohertz-scan-rates over nanosecond-time-delays without mechanical delay line},
  number={4},
  volume={88},
  journal={Applied Physics Letters},
  author={Bartels, Albrecht and Hudert, Florian and Janke, Christof and Dekorsy, Thomas and Köhler, Klaus},
  note={Article Number: 41117}
}
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