Ablation of metal films by picosecond laser pulses imaged with high-speed electron microscopy
- 1 September 1994
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 76 (5) , 3045-3048
- https://doi.org/10.1063/1.357484
Abstract
The ablation of free-standing metal films by picosecond laser pulses (50 ps, 0.6–8 J/cm2, 532 nm) was visualized by electron microscopy. Triple-frame high-speed transmission electron microscopy was applied, with exposure times below 5 ns and frame repetition times ≳20 ns. Ablation was observed to proceed by hole opening within 5–30 ns, speeding up with increasing laser fluence, and punching out of most of the melt. Once opened, the holes expanded by capillary forces with a velocity of ≊100 m/s for some 10 ns. At large pulse fluences the evaporation was collimated along the film axis. This and the absence of patterned flow of the melt are conspicuous differences to the ablation of films by nanosecond laser pulses. The effects typical for picosecond pulses are attributed to an evaporation that is one-sided because of a thermal gradient along the film axis, and that exerts a large recoil.This publication has 11 references indexed in Scilit:
- Laser ablation of absorbing liquidsApplied Physics B Laser and Optics, 1993
- Primary and secondary mechanisms in laser-pulse sputteringNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1992
- High-intensity ultraviolet laser interaction with a metallic filamentJournal of Applied Physics, 1992
- Laser-target interactions during pulsed laser deposition of superconducting thin filmsJournal of Applied Physics, 1991
- Laser ablation of aluminum at 193, 248, and 351 nmApplied Physics Letters, 1991
- Subsurface heating effects during pulsed laser evaporation of materialsApplied Physics Letters, 1990
- A reflection electron microscope for imaging of fast phase transitions on surfacesReview of Scientific Instruments, 1990
- Ultrafast imaging of ultraviolet laser ablation and etching of polymethylmethacrylateApplied Physics Letters, 1989
- Interaction of powerful laser radiation with the surfaces of semiconductors and metals: nonlinear optical effects and nonlinear optical diagnosticsSoviet Physics Uspekhi, 1985
- Laser sputteringNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1985