1. Near threshold nucleation and growth of cavitation bubbles generated with a picosecond laser
- Author
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Vid Agrež, Jaka Mur, Jaka Petelin, and Rok Petkovšek
- Subjects
bubble nucleation ,dual threshold ,shockwaves ,Acoustics and Ultrasonics ,Organic Chemistry ,udarni valovi ,laser induced breakdown ,micro cavitation ,udc:532.528 ,Inorganic Chemistry ,dvojni prag ,Chemical Engineering (miscellaneous) ,Environmental Chemistry ,lasersko povzročen preboj ,Radiology, Nuclear Medicine and imaging ,mikro kavitacija - Abstract
The nucleation and growth of cavitation bubbles few micrometers in size in water generated by a 60 ps 515 nm fiber laser is observed and visualized near nucleation threshold. The study is performed by monitoring the plasma size, the cavitation bubble size and the emitted shock waves. The latter two aspects are supported by the Gilmore model using a Noble-Abel-stiffened-gas (NASG) equations of state. For the first time, two types of cavitation events are identified and visualized that exhibit a difference of more than two orders of magnitude in the excitation energy converted to mechanical effects with minimal change in excitation laser pulse energy. The result is localized cavitation and reduced mechanical stress on water-based media with potentially positive implications for laser treatments of biological tissue.
- Published
- 2022