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Motion of bubble in solid by femtosecond laser pulses

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Abstract

We report that irradiation of femtosecond laser pulses moves a microscopic bubble inside crystalline calcium fluoride and amorphous silica glass. In situ observation revealed that the bubble moves against the direction of propagation of laser pulses as far as 2 microns. We also demonstrate the lateral movement of a void along the axis perpendicular to the beam propagation axis by shifting the laser focus.

©2002 Optical Society of America

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Supplementary Material (2)

Media 1: AVI (911 KB)     
Media 2: AVI (911 KB)     

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Figures (5)

Fig. 1.
Fig. 1. Schematic of experimental setup for creation by femtosecond laser pulses and in situ observation of voids. ND, HWP, and P denote neutral density filter, half-wave plate, and polarizer, respectively. OB1 and OB2 indicate objective lenses. L1 and L2 indicate lenses.
Fig. 2.
Fig. 2. Optical movement of a void under irradiation by successive laser shots. Side view of void was observed under illumination unpolarized halogen lamp.
Fig. 3.
Fig. 3. (2MB) Optical movement of a void under successive irradiation of laser shots. Energy : (a) 386 nJ/pulse and (b) 299 nJ/pulse, respcetively. The small circular spot in the left of each figure indicates the absolute position in the images. The number of shots is indicated upper right. [Media 1] [Media 2]
Fig. 4.
Fig. 4. Distance of movement of a void. ☐denotes the shape becomes elliptical along the optical axis..
Fig. 5.
Fig. 5. Lateral movement of a void perpendicular to the beam propagation axis. The void moves by 2 μm along the direction perpendicular to optical axis.
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