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Picosecond X-ray diffraction studies of laser-excited acoustic phonons in InSb

Författare:
  • Jörgen Larsson
  • A Allen
  • PH Bucksbaum
  • RW Falcone
  • A Lindenberg
  • G Naylor
  • T Missalla
  • DA Reis
  • K Scheidt
  • Anders Sjögren
  • P Sondhauss
  • M Wulff
  • JS Wark
Publiceringsår: 2002
Språk: Engelska
Sidor: 467-478
Publikation/Tidskrift/Serie: Applied Physics A Materials Science & Processing
Volym: 75
Nummer: 4
Dokumenttyp: Artikel
Förlag: Springer

Sammanfattning

We have employed time-resolved X-ray diffraction with picosecond temporal resolution to measure the time-dependent rocking curves of laser-irradiated asymmetrically cut single InSb crystals. Coherent acoustic phonons were excited in the crystals by irradiation with 800-nm, 100-fs laser pulses at irradiances between 0.25 and 12 mJ/cm(2). The induced time-dependent strain profiles (corresponding to the coherent phonons) were monitored by diffracting collimated, monochromatic pulses Of X-rays from the irradiated crystals. Recording of the diffracted radiation with a fast low-jitter X-ray streak camera resulted in an overall temporal resolution of better than 2 ps. The strain associated with the coherent phonons modifies the rocking curve of the crystal in a time-dependent manner, and the rocking curve is recorded by keeping the angle of incidence of the X-rays upon the crystal fixed, but varying the energy of the incident X-rays around a central energy of 8.453 keV (corresponding to the peak of the rocking curve of the unperturbed crystal). The observed time-dependent diffraction from the irradiated crystals is in reasonable agreement with simulations over a wide range of energies from the unperturbed rocking-curve peak.

Disputation

Nyckelord

  • Physics and Astronomy

Övrigt

Published
Yes
  • ISSN: 0947-8396

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