Journal
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
Volume 19, Issue 4, Pages 445-450Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b315856j
Keywords
-
Categories
Ask authors/readers for more resources
A new optical configuration for focusing laser radiation in laser ablation has been tested. The system uses a combination of an axicon and two plano-convex lenses placed along the beamline. With this set-up, the second harmonic of a flat top pulsed Nd:YAG laser beam was used to generate an annular plasma on the sample surface. The morphology of the axicon-generated craters was studied for variable focal positions. The annular plasma images were acquired with an intensified charge-coupled device with the imaging spectrograph in zero order. Time-resolved features of these images were studied as a function of beam focal conditions. A spectroscopy characterization of the annular plasmas in terms of electron temperature and electron density was carried Out. These parameters presented similar trends and fell from 11800 K to 8400 K and from 2.1 x 10(17) cm(3) to 1.3 x 10(17) cm(3), respectively, within a 100-400 ns delay time interval. The results demonstrate that at early times (200 ns) the electron density inside the plasma can be sufficient for secondary excitation of particulate matter.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available