Time-resolved measurements of shock-wave emission and cavitation-bubble generation in intraocular laser surgery with ps- and ns-pulses and related tissue effects

1993 ◽  
Author(s):  
Alfred Vogel ◽  
Stefan Busch ◽  
Mary Asiyo-Vogel
Keyword(s):  
Shock Wave ◽  
Cavitation Bubble ◽  
Laser Surgery ◽  
Time Resolved ◽  
Bubble Generation ◽  
Tissue Effects ◽  
Wave Emission ◽  
Time Resolved Measurements

Shock Wave Emission and Cavitation Bubble Generation in Laser Surgery

2015 ◽  
Vol 5 (4) ◽  
pp. 826-830 ◽  
Author(s):  
Liu Xiumei ◽  
Li Beibei ◽  
He Jie ◽  
Li Wenhua ◽  
Zhao Jiyun ◽  
...  
Keyword(s):  
Shock Wave ◽  
Cavitation Bubble ◽  
Laser Surgery ◽  
Bubble Generation ◽  
Wave Emission

Early Dynamics of a Laser-induced Underwater Shock Wave

2021 ◽  
Author(s):  
Guihua Lai ◽  
Siyuan Geng ◽  
Hanwen Zheng ◽  
Zhifeng Yao ◽  
Qiang Zhong ◽  
...  
Keyword(s):  
Shock Wave ◽  
Numerical Method ◽  
Cavitation Bubble ◽  
Laser Energy ◽  
Optical Breakdown ◽  
Pulsed Laser ◽  
Underwater Shock Wave ◽  
Time Resolved ◽  
High Attenuation ◽  
Nanosecond Pulsed Laser

Abstract The objective of this paper is to observe and investigate the early evolution of the shock wave, induced by a nanosecond pulsed laser in still water. A numerical method is performed to calculate the propagation of the shock wave within 1µs, after optical breakdown, based on the Gilmore model and the Kirkwood-Bethe hypothesis. The input parameters of the numerical method include the laser pulse duration, the size of the plasma and the maximally extended cavitation bubble, which are measured utilizing a high time-resolved shadowgraph system. The calculation results are verified by shock wave observation experiments at the cavitation bubble expansion stage. The relative errors of the radiuses and the velocity of the shock wave front, reach the maximum value of 45% at 5 ns after breakdown and decrease to less than 20% within 20 ns. The high attenuation characteristics of the shock wave after the optical breakdown, are predicted by the numerical method. The quick time and space evolution of the shock wave are carefully analyzed. The normalized shock wave width is found to be independent of the laser energy and duration, and the energy partitions ratio is around 2.0 using the nanosecond pulsed laser.

Lighting and Shock Wave Emission of Laser Cavitation Bubble Collapse

2010 ◽  
Vol 37 (4) ◽  
pp. 1000-1006 ◽  
Author(s):  
宗思光 Zong Siguang ◽  
王江安 Wang Jiang′an ◽  
马治国 Ma Zhiguo
Keyword(s):  
Shock Wave ◽  
Cavitation Bubble ◽  
Bubble Collapse ◽  
Wave Emission

Propagation of Shock Wave At the Cavitation Bubble Expansion Stage Induced by a Nanosecond Laser Pulse

2021 ◽  
Author(s):  
Siyuan Geng ◽  
Zhifeng Yao ◽  
Qiang Zhong ◽  
Yuxin Du ◽  
Ruofu Xiao ◽  
...  
Keyword(s):  
Shock Wave ◽  
Laser Pulse ◽  
Wave Front ◽  
Cavitation Bubble ◽  
Bubble Radius ◽  
Front Velocity ◽  
High Time ◽  
Nanosecond Laser ◽  
Time Resolved ◽  
Expansion Stage

Abstract The objective of this paper is to reveal the attenuation characteristics of a shock wave after optical breakdown in water, with laser pulses of 10-ns duration. A high time-resolved shadowgraph method is applied to capture the temporal evolutions of the cavitation bubble wall and shock wave. The experiments are carried out on a single bubble generated far away from the free surface and the rigid walls with laser pulse energies of 22 mJ, 45 mJ and 60 mJ. The results show that a high, time-resolved, wave front velocity of the shock wave is identified, and the maximum velocity can reach up to around 4000 m/s. An asymmetric shock wave is observed at the very start of the bubble expansion stage, and the process of the sharp attenuation of wave front velocity down to sound velocity, is accomplished within 310-ns. The possible relationship of the cavitation bubble and the shock wave is discussed and a prediction model, using the maximum bubble radius and the corresponding time calculated by the Gilmore model, is proposed to calculate the location of the wave front.

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