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The role of electrostriction in the generation of acoustic waves by optical forces in water
ID Astrath, Nelson Guilherme Castelli (Author), ID Anghinoni, Bruno (Author), ID Flizikowski, Gabriel Antonio Siqueira (Author), ID Zanuto, V. S. (Author), ID Malacarne, Luis Carlos (Author), ID Baesso, Mauro L. (Author), ID Požar, Tomaž (Author), ID Razansky, D. (Author)

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Abstract
We present semi-analytical solutions describing the spatiotemporal distributions of temperature and pressure inside low-absorbing dielectrics excited by tightly focused laser beams. These solutions are compared to measurements in water associated with variations of the local refractive index due to acoustic waves generated by electrostriction, heat deposition, and the Kerr effect at different temperatures. The experimental results exhibited an excellent agreement with the modeling predictions, with electrostriction being the dominant transient effect in the acoustic wave generation. Measurements at show that the thermoelastic contribution to the optical signal is significantly reduced due to the low thermal expansion coefficient of water at this temperature.

Language:English
Keywords:electrostriction, radiation forces, photo-induced lensing effect, pressure-transients, Kerr lens
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2023
Number of pages:7 str.
Numbering:Vol. 29
PID:20.500.12556/RUL-143895 This link opens in a new window
UDC:534
ISSN on article:2213-5979
DOI:10.1016/j.pacs.2022.100445 This link opens in a new window
COBISS.SI-ID:138249987 This link opens in a new window
Publication date in RUL:18.01.2023
Views:973
Downloads:57
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Record is a part of a journal

Title:Photoacoustics
Publisher:Elsevier
ISSN:2213-5979
COBISS.SI-ID:519718169 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Title:Vloga elektrostrikcije pri tvorbi akustičnih valov z optičnimi silami v vodi
Abstract:
Predstavljamo pol-analitične rešitve, ki opisujejo prostorsko-časovne porazdelitve temperature in tlaka znotraj dielektrikov z nizko absorpcijo, ki jih vzbujamo s tesno fokusirani laserski žarki. Te rešitve primerjamo pri različnih temperaturah z meritvami v vodi, ki so povezane s spremembami lokalnega lomnega količnika kot posledica preleta akustičnih valov, ki nastanejo z elektrostrikcijo in z odlaganjem toplote ter s Kerrovim učinkom. Eksperimentalni rezultati so pokazali odlično skladnost z napovedmi modeliranja, pri čemer je bila elektrostrikcija prevladujoč prehodni učinek pri ustvarjanju akustičnih valov. Meritve pri 4,0 °C kažejo, da je termoelastični prispevek k optičnemu signalu znatno oslabljen zaradi nizkega toplotnega razteznega koeficienta vode pri tej temperaturi.

Keywords:elektrostrikcija, sevalna sila, učinek fotoinduciranega lečenja, prehodni tlak, Kerrova leča

Projects

Funder:ARRS - Slovenian Research Agency
Project number:P2-0231
Name:Tribologija

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