title: Picosecond laser ultrasonics for imaging of transparent polycrystalline materials compressed to megabar pressures.
abstract: Picosecond laser ultrasonics is an all-optical experimental technique based on ultrafast high repetition rate lasers applied for the generation and detection of nanometric in length coherent acoustic pulses. In optically transparent materials these pulses can be detected not only on their arrival at the sample surfaces but also all along their propagation path inside the sample providing opportunity for imaging of the sample material spatial inhomogeneities traversed by the acoustic pulse. Application of this imaging technique to polycrystalline elastically anisotropic transparent materials subject to high pressures in a diamond anvil cell reveals their significant texturing/structuring at the spatial scales exceeding dimensions of the individual crystallites.
authors.affiliation: LAUM, UMR-CNRS 6613, Université du Maine, Le Mans, France.
authors.forename: Maju
authors.initials: M
authors.lastname: Kuriakose
authors.affiliation: LAUM, UMR-CNRS 6613, Université du Maine, Le Mans, France.
authors.forename: Samuel
authors.initials: S
authors.lastname: Raetz
authors.affiliation: LAUM, UMR-CNRS 6613, Université du Maine, Le Mans, France.
authors.forename: Nikolay
authors.initials: N
authors.lastname: Chigarev
authors.affiliation: LAUM, UMR-CNRS 6613, Université du Maine, Le Mans, France.
authors.forename: Sergey M
authors.initials: SM
authors.lastname: Nikitin
authors.affiliation: IMMM, UMR-CNRS 6283, Université du Maine, Le Mans, France.
authors.forename: Alain
authors.initials: A
authors.lastname: Bulou
authors.affiliation: LAUM, UMR-CNRS 6613, Université du Maine, Le Mans, France; CEA Saclay DIGITEO Labs, Gif-Sur-Yvette, France.
authors.forename: Damien
authors.initials: D
authors.lastname: Gasteau
authors.affiliation: LAUM, UMR-CNRS 6613, Université du Maine, Le Mans, France.
authors.forename: Vincent
authors.initials: V
authors.lastname: Tournat
authors.affiliation: LAUM, UMR-CNRS 6613, Université du Maine, Le Mans, France.
authors.forename: Bernard
authors.initials: B
authors.lastname: Castagnede
authors.affiliation: LSPM, UPR-CNRS 3407, Université Paris Nord, Villetaneuse, France. Electronic address: zerr@univ-paris13.fr.
authors.forename: Andreas
authors.initials: A
authors.lastname: Zerr
authors.affiliation: LAUM, UMR-CNRS 6613, Université du Maine, Le Mans, France. Electronic address: vitali.goussev@univ-lemans.fr.
authors.forename: Vitalyi E
authors.initials: VE
authors.lastname: Gusev
keywords: 3D imaging; High pressures; Laser ultrasonics; Picosecond ultrasonic interferometry; Time-domain Brillouin scattering