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Schematic of the experimental setup for studying LIOB and bubble trapping by femtosecond laser using ultrasonic and optical imaging.
Optical images taken at different time points showing the process of LIOB, bubble generation, trapping, and decreasing in size by upward directing femtosecond laser pulses (enhanced online). [URL: http://dx.doi.org/10.1063/1.3187535.1]10.1063/1.3187535.1
Acoustic signals associated with the laser focus. (a) Ultrasound -mode image showing no signals before laser illumination. (b) -mode image of the laser focus (arrow) and distributed small dots within a narrow band zone across the focus. (c) Acoustic signals at the new laser focal location (top arrow) and a stably trapped bubble (bottom arrow). (d) -mode ultrasound image showing the pulse-echo signals of the laser focus, from the laser illumination to the occurrence of LIOB, and the short pulses with interval of .
Trapping of multiple bubbles by a vertically directed SF femtosecond laser. (a) Optical image of four trapped bubbles. (b) -mode ultrasound image of the same bubbles (enhanced online). [URL: http://dx.doi.org/10.1063/1.3187535.2] [URL: http://dx.doi.org/10.1063/1.3187535.3]10.1063/1.3187535.210.1063/1.3187535.3
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