Ultrasound induced by CW laser cavitation bubbles

Korneev, N.; Montero, P. Rodriguez; Ramos-Garcı́a, R.; Ramírez-San-Juan, J. C.; Padilla-Martínez, Juan Pablo

doi:10.1088/1742-6596/278/1/012029

Cited by 10 publications

(10 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For many applications such as surface damage 33 and ultrasound generation, 7 it is desirable to obtain the largest bubble possible. As mentioned earlier, this can be achieved by increasing the spot size in order to increase the superheated volume.…”

Section: Resultsmentioning

confidence: 99%

“…Due to the short light penetration depth (∼74 µm), changing the position of the focal point only changes the volume of the superheated volume and, therefore, the size of the bubble and amplitude of the emitted shockwave. 7,29 In contrast, bubbles created with short pulsed lasers in transparent solutions are always produced at the focal point where the intensity is the highest. The left-most image in Figure 2(a) corresponds to the shadow produced just before vapor bubble formation.…”

Section: Experimental Descriptionmentioning

confidence: 99%

“…2 Since then, a great deal of work describing cavitation bubbles has been published and compiled in several books [3][4][5] providing a good understanding of the physics of bubble dynamics. Cavitation bubble's collapse is responsible for a number of interesting phenomena including: luminescence, 6 ultrasound generation, 7 damage to surfaces, 8 surface cleaning, 9 and medical applications such as lithotripsy 10,11 among others.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optic cavitation with CW lasers: A review

et al. 2014

View full text Add to dashboard Cite

The most common method to generate optic cavitation involves the focusing of short-pulsed lasers in a transparent liquid media. In this work, we review a novel method of optic cavitation that uses low power CW lasers incident in highly absorbing liquids. This novel method of cavitation is called thermocavitation. Light absorbed heats up the liquid beyond its boiling temperature (spinodal limit) in a time span of microseconds to milliseconds (depending on the optical intensity). Once the liquid is heated up to its spinodal limit (∼300 °C for pure water), the superheated water becomes unstable to random density fluctuations and an explosive phase transition to vapor takes place producing a fast-expanding vapor bubble. Eventually, the bubble collapses emitting a strong shock-wave. The bubble is always attached to the surface taking a semi-spherical shape, in contrast to that produced by pulsed lasers in transparent liquids, where the bubble is produced at the focal point. Using high speed video (105 frames/s), we study the bubble’s dynamic behavior. Finally, we show that heat diffusion determines the water superheated volume and, therefore, the amplitude of the shock wave. A full experimental characterization of thermocavitation is described.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Experimental Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optic cavitation with CW lasers: A review

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The amplitude of the shockwave was measured to be ~1MPa for a ~300 µm bubble radius [11]. We found that the bubble radius and the shock wave amplitude, decreases linearly as the intensity increases [12]. For our current conditions, the amplitude of the shock wave is estimated to be ~0.1 MPa.…”

Section: Resultsmentioning

confidence: 68%

Micro-hole drilling in thin films with cw low power lasers

Ramírez-San-Juan

Padilla-Martínez

Zaca-Morán³

et al. 2011

Opt. Mater. Express

View full text Add to dashboard Cite

In this work, we perform drilling of micro-holes and micropatterning in indium tin oxide (ITO) and titanium thin films. In ITO films the drilling is performed by thermocavitation only; meanwhile in titanium two competing processes are identified: (i) laser-induced sublimation producing high-quality micro-holes comparable to those produced with femtosecond pulses but at a reduced cost and (ii) erosion by thermocavitation which tend to degrade the quality of the micro-holes. The micro-holes can be employed as micrometer light sources for use in pointdiffraction interferometers or spatial filters; in addition, micron-sized resolution patterning can be performed.

show abstract

“…Cavitation has attracted a great deal of interest because bubble´s collapse is responsible for a number of phenomena of quite interesting phenomena in science and engineering: sonoluminescence [4], shockwave generation [5], cavitation damage [6], surface cleaning [7], etc. The most common methods to produce cavitation bubbles includes: pulsed lasers focused into low absorption coefficient solutions (optics cavitation) [8]; the use of ultrasound generated by transducers (acoustic cavitation) [9], (is the most common techniques used in medicine); and when a liquid is agitated violently like in ships propellers or hydraulic machinery (hydraulic cavitation) [10].…”

Section: Introductionmentioning

confidence: 99%

Temporal evolution of thermocavitation bubbles using high speed video camera

et al. 2011

View full text Add to dashboard Cite

In this work, we present a novel method of cavitation, thermocavitation, induced by CW low power laser radiation in a highly absorbing solution of copper nitrate (CuNO 4 ) dissolved in deionized water. The high absorption coefficient of the solution (α=135 cm -1 ) produces an overheated region (~300°C) followed by explosive phase transition and consequently the formation of an expanding vapor bubble, which later collapse very rapidly emitting intense acoustic shockwaves. We study the dynamic behavior of bubbles formed in contact with solid interface as a function of laser power using high speed video recording with rates of ∼10 5 fps. The bubble grows regularly without any significant modification of its halfhemisphere shape, it reaches its maximum radius, but it deforms in the final stage of the collapse, probably due to the bubble adhesion to the surface. We also show that the maximum bubble radius and the shock-wave energy scales are inversely with the beam intensity.

show abstract

Ultrasound induced by CW laser cavitation bubbles

Cited by 10 publications

References 5 publications

Optic cavitation with CW lasers: A review

Optic cavitation with CW lasers: A review

Micro-hole drilling in thin films with cw low power lasers

Temporal evolution of thermocavitation bubbles using high speed video camera

Contact Info

Product

Resources

About