N. G. C. Astrath (Author), B. Anghinoni (Author), G. A. S. Flizikowski (Author), V. S. Zanuto (Author), Luis Carlos Malacarne (Author), Mauro L. Baesso (Author), Tomaž Požar (Author), D. Razansky (Author)

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.

Keywords

electrostriction;radiation forces;photo-induced lensing effect;pressure-transients;Kerr lens;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 534
COBISS: 138249987 Link will open in a new window
ISSN: 2213-5979
Views: 1399
Downloads: 128
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Other data

Secondary language: Slovenian
Secondary title: Vloga elektrostrikcije pri tvorbi akustičnih valov z optičnimi silami v vodi
Secondary 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.
Secondary keywords: elektrostrikcija;sevalna sila;učinek fotoinduciranega lečenja;prehodni tlak;Kerrova leča;
Type (COBISS): Article
Pages: str. 1-7
Issue: ǂVol. ǂ29
Chronology: Feb. 2023
DOI: 10.1016/j.pacs.2022.100445
ID: 17754886