Picosecond ultrasonics with miniaturized semiconductor lasers

Michael Kobecki, Guiseppe Tandoi, Eugenio Di Gaetano, Marc Sorel, Alexey V. Scherbakov, Thomas Czerniuk, Christian Schneider, Martin Kamp, Sven Höfling, Andrey V. Akimov, Manfred Bayer

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
2 Downloads (Pure)

Abstract

There is a great desire to extend ultrasonic techniques to the imaging and characterization of nanoobjects. This can be achieved by picosecond ultrasonics, where by using ultrafast lasers it is possible to generate and detect acoustic waves with frequencies up to terahertz and wavelengths down to nanometers. In our work we present a picosecond ultrasonics setup based on miniaturized mode-locked semiconductor lasers, whose performance allows us to obtain the necessary power, pulse duration and repetition rate. Using such a laser, we measure the ultrasonic echo signal with picosecond resolution in a 112 nm thick Al film deposited on a semiconductor substrate. We show that the obtained signal is as good as the signal obtained with a standard bulky mode-locked Ti-Sa laser. The experiments pave the way for designing integrated portable picosecond ultrasonic setups on the basis of miniaturized semiconductor lasers.
Original languageEnglish
JournalUltrasonics
Early online date3 Apr 2020
DOIs
Publication statusE-pub ahead of print - 3 Apr 2020

Keywords

  • Picosecond ultrasonics
  • Semiconductor lasers
  • Coherent phonons

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