Comparison of coherent and incoherent LO phonons in isotopic 70Ge/74Ge superlattices

M. Nakajima, K. Mizoguchi, K. Morita, K. Itoh, H. Harima, S. Nakashima

Research output: Contribution to journalConference articlepeer-review


Coherent LO phonon oscillations excited by 20-fs ultrashort laser pulses have been observed in isotopic 70Ge/74Ge superlattices by a pump-probe technique. Fourier-transformed spectra of the time-domain signal were compared with incoherent LO phonon spectra measured by Raman spectroscopy. The spectra of coherent phonons are quite different from the Raman spectra with common excitation wavelength. This comparison indicates that the pump-probe experiment detects the region which is different from where Raman experiment probes.

Original languageEnglish
Pages (from-to)942-944
Number of pages3
JournalJournal of Luminescence
Publication statusPublished - 2000 May
EventInternational Conference on Luminescence and Optical Spectroscopy of Condensed Matter (ICL'99) - Osaka, Jpn
Duration: 1999 Aug 231999 Aug 27

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • General Chemistry
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


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