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Proceedings Paper

Dynamical observation on laser ablation in bulk transparent materials
Author(s): Yoshiro Ito; Tsutomu Ogura; Yaushi Fukuzawa; Susumu Nakamura
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Paper Abstract

Laser ablation of transparent materials is induced by non- linear absorption and some laser-induced damages are introduced in the bulk as well as on the surface. This process is used in laser marking and other applications such as refractive index modification of optical materials and 3- D data storage. We have observed the laser ablation dynamics in inside of bulk transparent materials by nanosecond time- resolved imaging technique. Output of fundamental radiation (1064nm) from a Q-switched Nd:YAG laser was focused at the inside of bulk PMMA and soda glass. Second harmonic radiation (532nm) from the same laser was used as illuminating light and images were taken by a CCD camera with a band-pass filter at 532 nm. Series of images were taken at different intervals between the fundamental and the second harmonic light, which was controlled by the optical delay line. In observation at longer intervals than 50ns, another laser was used as illuminating source. When the laser was focused at inside of the bulk PMMA, damages occurred simultaneously at several independent points without the ablation at the surface. They located along laser incident axis. Propagation of shock waves, which started from these points, was clearly observed in the bulk. In the glass, absorbing point in the bulk formed a continuous line and its end-point moved from inside outward to the surface along the laser beam. Laser induced damages (cracks) continued to develop until some microseconds after laser pulse in PMMA.

Paper Details

Date Published: 13 September 2002
PDF: 10 pages
Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); doi: 10.1117/12.482078
Show Author Affiliations
Yoshiro Ito, Nagaoka Univ. of Technology (Japan)
Tsutomu Ogura, Nagaoka Univ. of Technology (Japan)
Yaushi Fukuzawa, Nagaoka Univ. of Technology (Japan)
Susumu Nakamura, Nagaoka National College of Technology (Japan)

Published in SPIE Proceedings Vol. 4760:
High-Power Laser Ablation IV
Claude R. Phipps, Editor(s)

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