Schlieren measurements of the hydrodynamics of excimer laser ablation of polymers in atmospheric pressure gas
- 1 August 1990
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 68 (3) , 965-968
- https://doi.org/10.1063/1.346661
Abstract
Pulsed schlieren photography and fast helium-neon laser deflection are used to study the hydrodynamics of laser ablation of polyethyleneterephthalate and polymethylmethacrylate by pulsed KrF (248 nm) radiation in atmospheric air, Ar and N2. Schlieren measurements show the evolution of shock waves, sound waves, and reduced-density, hot gas plumes. A transition from sound to shock at the ablation threshold for both polymers is observed. The shock velocity of PET tends to approach agreement with blast wave theory at fluences higher than 1 J/cm2. Plumes in air are consistently larger than those produced in Ar and N2 (at fluences below 5 J/cm2) suggesting that combustion may occur. Laser deflection measurements for PET at 150 mJ/cm2 indicate a plume density of 0.6 kg/m3 (50% atmospheric density).This publication has 11 references indexed in Scilit:
- The significance of a fluence threshold for ultraviolet laser ablation and etching of polymersJournal of Applied Physics, 1990
- Ultrafast imaging of ultraviolet laser ablation and etching of polymethylmethacrylateApplied Physics Letters, 1989
- Laser beam deflection as a probe of laser ablation of materialsApplied Physics Letters, 1989
- Modeling Of Laser Ablation And Fragmentation Of Human CalculiPublished by SPIE-Intl Soc Optical Eng ,1989
- Spectroscopic and fast photographic studies of excimer laser polymer ablationJournal of Applied Physics, 1988
- Fast, sensitive laser deflection system suitable for transient plasma analysisReview of Scientific Instruments, 1987
- Observation of shock waves and cooling waves in the laser ablation of Kapton films in airApplied Physics Letters, 1987
- Mechanism of the ultraviolet laser ablation of polymethyl methacrylate at 193 and 248 nm: laser-induced fluorescence analysis, chemical analysis, and doping studiesJournal of the Optical Society of America B, 1986
- Nanosecond photoacoustic studies on ultraviolet laser ablation of organic polymersApplied Physics Letters, 1986
- Boundary effects on the dynamics of channels generated by laser-initiated dischargesPhysics of Fluids, 1982