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

Summary, in English

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.

• 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
• Avdelning/ar: Atomfysik
• Publiceringsår: 2002
• Språk: Engelska
• Sidor: 467-478
• Publikation/Tidskrift/Serie: Applied Physics A: Materials Science & Processing
• Volym: 75
• Issue: 4
• Fulltext: - 841 kB; Download statistics
• Länkar: http://dx.doi.org/10.1007/s003390201421
• Dokumenttyp: Artikel i tidskrift
• Förlag: Springer
• Ämne: Atom and Molecular Physics and Optics
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 1432-0630