title: Remote photoacoustic imaging on solid material using a two-wave mixing interferometer.
abstract: We report on remote and contactless photoacoustic imaging (PAI) for the inspection of solid materials using a two-wave mixing interferometer. In this Letter, a semitransparent sample was excited with picosecond laser pulses. The local absorption of the electromagnetic radiation led to generation of broadband ultrasonic waves inside the sample. Ultrasonic waves arriving at the sample surface were detected utilizing a two-wave mixing interferometer. After data acquisition, the initial pressure distribution was reconstructed using a Fourier space synthetic aperture technique algorithm. We show the potential of PAI for the inspection of semitransparent solid materials.
authors.affiliation: Christian Doppler Laboratory of Photoacoustic Imaging and Laser Ultrasonics, Hafenstrasse 47-51, 4020 Linz, Austria. thomas.berer@recendt.at
authors.forename: Thomas
authors.initials: T
authors.lastname: Berer
authors.forename: Armin
authors.initials: A
authors.lastname: Hochreiner
authors.forename: Saeid
authors.initials: S
authors.lastname: Zamiri
authors.forename: Peter
authors.initials: P
authors.lastname: Burgholzer
mesh_terms: D000162:Acoustics; D000465:Algorithms; D007368:Interferometry / Q000379:methods*; D007834:Lasers; D013499:Surface Properties