Laser-beam deflection measurements and modeling of pulsed laser ablation rate and near-surface plume densities in vacuum
- Intense Energy Beam Interaction Laboratory, Nuclear Engineering Department, The University of Michigan, Ann Arbor, Michigan 48109-2104 (US)
- Physics Department, General Motors Research Laboratories, Warren, Michigan 48090-9055 (US)
Quantitative measurements of ablated material from the surface of polyethyleneterephthalate (PET) by 248-nm excimer laser fluences up to 10 J/cm{sup 2} are performed by HeNe laser-beam deflection in vacuum and by photoacoustic depth profiling in air. HeNe laser-beam deflection measures the density of gas phase material present in the ablation plume. Photoacoustic depth profiling is a nonintrusive diagnostic that directly measures the etch depths from laser ablation. A hydrodynamic model consisting of a centered rarefaction wave that reflects off the PET surface is shown to describe the laser deflection signals. From these measurements an estimate of the initial temperature of the ablated species is found.
- OSTI ID:
- 5553499
- Journal Information:
- Journal of Applied Physics; (USA), Vol. 70:2; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Near-field thermal radiative transfer and thermoacoustic effects from vapor plumes produced by pulsed CO{sub 2} laser ablation of bulk water
Schlieren and dye laser resonance absorption photographic investigations of KrF excimer laser-ablated atoms and molecules from polyimide, polyethyleneterephthalate, and aluminum