Laser-induced ultrasonic waveform derivation and transition from a point to a homogeneous illumination of a plate

Laloš, Jernej (author), Jezeršek, Matija (author), Petkovšek, Rok (author), Požar, Tomaž (author)

Ultrasound modeling, being an established practice, is used to study the fundamentals of light-matter interactions. Although much has been published on the matter, pressure and thermal expansion induction mechanisms in laser ultrasonics have rarely been combined, as they should, in a single ultrasonic source while the effects of its size variation have only been shown to a limited extent. In the paper, we unite these light-matter interaction mechanisms, with inclusion of lateral optical forces, into a single laser-stimulated source as it is observed in nature. With a laser pulse as a manipulable source, we simulate the multifaceted workings of light-matter interactions by exposing the distinct transients originating from different source localities as generated by different induction mechanisms. We also present a transition of simulated ultrasonic waveforms in the epicentral point on the surface of a solid plate opposite from the source while it is expanded from a point to a quasi-limitless extent for pressure and thermal expansion generation regimes. The model utilizes geometric probability theory together with Huygens' superposition principle and temporal convolutions to construct the desired waveforms out of individual Green's functions. We show how the ultrasound generation regimes stem out of a single source and how its size together with energy and momentum transfers during the light-matter interactions affect the induced ultrasonic transients.

• Language: English
• Keywords: laser ultrasonics, optical forces, radiation pressure, thermoelastic expansion, waveform modeling
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Year: 2017
• Number of pages: Str. [158]-166
• Numbering: Vol. 81
• PID: 20.500.12556/RUL-105465
• UDC: 534./.5:621.375.826
• ISSN on article: 0041-624X
• DOI: 10.1016/j.ultras.2017.06.018
• COBISS.SI-ID: 15537691
• Publication date in RUL: 30.11.2018

LALOŠ, Jernej, JEZERŠEK, Matija, PETKOVŠEK, Rok and POŽAR, Tomaž, 2017, Laser-induced ultrasonic waveform derivation and transition from a point to a homogeneous illumination of a plate. Ultrasonics [online]. 2017. Vol. 81, p. 158–166. [Accessed 14 April 2025]. DOI 10.1016/j.ultras.2017.06.018. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=105465

Record is a part of a journal

• Title: Ultrasonics
• Shortened title: Ultrasonics
• Publisher: Butterworth Scientific
• ISSN: 0041-624X
• COBISS.SI-ID: 26569728

Secondary language

• Language: Slovenian
• Title: Izpeljava lasersko induciranega ultrazvočnega valovanja in njegov prehod iz točkastega v homogeno osvetlitev plošče

Abstract

Modeliranje ultrazvoka je ustaljena praksa, ki se uporablja za preučevanje osnov interakcij med svetlobo in snovjo. Čeprav je bilo mnogo objavljenega na to temo, sta bila tlačni in toplotno raztezni mehanizem vzbujanja redko združena v en ultrazvočni vir, medtem ko so bili učinki spreminjanja njegove velikosti prikazani le v omejenih razponih. V prispevku tako združimo ta interakcijska mehanizma, skupaj z lateralnimi optičnimi silami, v lasersko vzbujen vir, kot ga opazimo v naravi. Z laserskim bliskom kot spremenljivim virom simuliramo raznoliko delovanje interakcije med svetlobo in snovjo z razkritjem značilnih prehodnih valov, ki jih vzbudijo različni mehanizmi vzbujanja in izvirajo iz različnih predelov vira. Za tlačno in toplotno raztezne mehanizme vzbujanja predstavimo tudi prehod simuliranih ultrazvočnih valov v epicentralni točki na površini trdne plošče nasproti vira, ko se ta širi iz ene točke do skoraj neomejenih razsežnosti. Z uporabo teorije geometrijske verjetnosti, Huygensovega principa superpozicije in časovnih konvolucij razviti model sestavi

• Keywords: laserski ultrazvok, optične sile, sevalni tlak, termoelastično raztezanje, modeliranje valovanja

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0392
• Name: Optodinamika