Amplification of high-intensity pressure waves and cavitation in water using a multi-pulsed laser excitation and black-TiOx optoacoustic lens

Blaž Tašič Muc (Author), Daniele Vella (Author), Nejc Lukač (Author), Matjaž Kos (Author), Matija Jezeršek (Author)

Abstract

A method for amplification of high-intensity pressure waves generated with a multi-pulsed Nd:YAG laser coupled with a black-TiOx optoacoustic lens in the water is presented and characterized. The investigation was focused on determining how the multi-pulsed laser excitation with delays between 50 µs and 400 µs influences the dynamics of the bubbles formed by a laser-induced breakdown on the upper surface of the lens, the acoustic cavitation in the focal region of the lens, and the high-intensity pressure waves generation. A needle hydrophone and a high-speed camera were used to analyze the spatial distribution and time-dependent development of the above-mentioned phenomena. Our results show how different delays (t$_d$) of the laser pulses influence optoacoustic dynamics. When t$_d$ is equal to or greater than the bubble oscillation time, acoustic cavitation cloud size increases 10-fold after the fourth laser pulse, while the pressure amplitude increases by more than 75%. A quasi-deterministic creation of cavitation due to consecutive transient pressure waves is also discussed. This is relevant for localized ablative laser therapy.

Keywords

črni TiOx;optoakustične leče;akustična kavitacija;lasersko induciran ultrazvok;black-tiox;optoacoustic lens;acoustic cavitation;laser induced ultrasound;

Data

Language:	English
Year of publishing:	2022
Typology:	1.01 - Original Scientific Article
Organization:	UL FS - Faculty of Mechanical Engineering
UDC:	534
COBISS:	112319235
ISSN:	2156-7085
Views:	177
Downloads:	66
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	črni TiOx;optoakustične leče;akustična kavitacija;lasersko inducirani ultrazvok;
Type (COBISS):	Article
Pages:	str. 3993-4006
Volume:	ǂVol. ǂ13
Issue:	ǂiss. ǂ7
Chronology:	Jun. 2022
DOI:	10.1364/BOE.460713
ID:	15702053