30 December 2008 Ejection of glass rings during tightly focused femtosecond laser damage at a glass surface
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Abstract
We observe a discontinuity in the scaling between the size of damage and the pulse energy for femtosecond laser pulses tightly focused at a glass surface. This discontinuity corresponds to the threshold for formation and ejection of rings of material surrounding the focus center. The mechanism for the generation of these structures appears distinct from that of the central holes and is ascribed to subsurface absorption leading to thermal expansion and shock wave formation.
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Jeffrey F. Herbstman, Steven M. Yalisove, Alan J. Hunt, "Ejection of glass rings during tightly focused femtosecond laser damage at a glass surface", Proc. SPIE 7132, Laser-Induced Damage in Optical Materials: 2008, 713208 (30 December 2008); doi: 10.1117/12.804154; https://doi.org/10.1117/12.804154
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KEYWORDS
Glasses

Femtosecond phenomena

Absorption

Laser damage threshold

Polarization

Pulsed laser operation

Ferroelectric materials

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