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

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.

Subject (DDC)

530 Physics

Cite This

ISO 690

BARTELS, 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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