Generation of ion beams on a steel surface by laser radiation at various wavelengths under the presence of an applied electric field
✍ Scribed by A. A. I. Khalil; M. C. Richardson
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 364 KB
- Volume
- 3
- Category
- Article
- ISSN
- 1612-2011
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✦ Synopsis
This paper describes the generation of highly stripped
ions and high currents in laser produced steel plasma in an
applied electric field. A steel target kept under partial vacuum
conditions (10^-3^ mbar) is irradiated with focused Q-switched
Nd:YAG laser radiation of various wavelengths with various pulse
durations. The evaporated ions were detected at a distance of
40 mm from the target, after passing through a retarding mesh
grid. The laser radiation, with peak intensity between
5.35×10^9^ to 1 × 10^11^ W/cm^2^ creates a dense
plasma having a high ionization state. The velocity distribution
function of the plasma cloud emitted from the plasma is
investigated using a Faraday cup. The dependence of the current
signals on various parameters, such as laser power, laser
wavelengths, pulse widths and argon (Ar) pressure, is described.
In addition the I-V characteristics of the plasma in the presence
of glow discharge were studied with and without laser radiation.
In general, an increase in the plume current was observed as the
mesh voltage is increased, and is related to arc formation. The
possibility to find microablation was noted by using Reflection
Optical Microscope (ROM).