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Wide spectral range ultrafast pump-probe magneto-optical spectrometer at low temperature, high-magnetic and electric fields

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2020

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Mertens, Fabian
Terschanski, Marc
Mönkebüscher, David
Ponzoni, Stefano
Cinchetti, Mirko

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Review of Scientific Instruments. American Institute of Physics (AIP). 2020, 91(11), 113001. ISSN 0034-6748. eISSN 1089-7623. Available under: doi: 10.1063/5.0024449

Zusammenfassung

We developed a table-top setup to perform magneto-optical pump-probe measurements with the possibility to independently tune the photon-energy of both pump and probe beams in the 0.5 eV-3.5 eV range. Our apparatus relies on a commercial turn-key amplified laser system, able to generate light pulses with duration shorter than or comparable to 100 fs throughout the whole spectral range. The repetition rate of the source can be modified via the computer in the 1 kHz to 1 MHz range. A commercial balanced detector is connected to a high-frequency digitizer, allowing for a highly-sensitive detection scheme: rotations of the probe polarization as small as 70 μdeg can be measured. Additionally, a DC magnetic field as high as 9 T and voltages in the kV regime can be applied on the sample. A cryostat allows us to precisely set the temperature of the specimen in the 4 K-420 K interval. We prove the performance of our setup by measuring the ultrafast demagnetization of a cobalt crystal as a function of a wide variety of experimental parameters.

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ISO 690MERTENS, Fabian, Marc TERSCHANSKI, David MÖNKEBÜSCHER, Stefano PONZONI, Davide BOSSINI, Mirko CINCHETTI, 2020. Wide spectral range ultrafast pump-probe magneto-optical spectrometer at low temperature, high-magnetic and electric fields. In: Review of Scientific Instruments. American Institute of Physics (AIP). 2020, 91(11), 113001. ISSN 0034-6748. eISSN 1089-7623. Available under: doi: 10.1063/5.0024449
BibTex
@article{Mertens2020-11-01spect-53318,
  year={2020},
  doi={10.1063/5.0024449},
  title={Wide spectral range ultrafast pump-probe magneto-optical spectrometer at low temperature, high-magnetic and electric fields},
  number={11},
  volume={91},
  issn={0034-6748},
  journal={Review of Scientific Instruments},
  author={Mertens, Fabian and Terschanski, Marc and Mönkebüscher, David and Ponzoni, Stefano and Bossini, Davide and Cinchetti, Mirko},
  note={Article Number: 113001}
}
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