Nitrogen laser beam interaction with copper surface

Scientific paper - Original scientific paper

• Author: Višnja Henč-Bartolić
• Author: Željko reić
• Author: Mirko Stubičar
• Author: Hans-Joachim Kunze
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

The ultraviolet and visible spectra of plasmas produced by N_2-laser radiation focused onto a copper target in air and in vacuum have been recorded photographically. The nitrogen laser beam (α = 337 nm) had a maximum energy density of 1.1 J/cm^2, the pulse duration was 6 ns, and the repetition rate 0.2 Hz. The measured electron temperature was 15000 K (±30%) in air and 13000 K (±50%) in vacuum and the electron densities were 6.5×10^17 cm^-3 (±60%) and 3.0×10^17 cm^-3 (±60%), respectively. The irradiated surface in air and in vacuum was studied employing a metallographic microscope. In vacuum, the droplets were created and expulsed at the crater edges. Their formation is explained by the hydrodynamical model. They were formed in a time interval which is about two times shorter than the duration of the laser pulse. In air, droplets were also formed. The weight loss from the Cu-crater in vacuum was about 0.3×10^-4 µmole/pulse, in air it was about three times less.

• Keywords (english): laser-induced plasma; N2-laser radiation; short pulses; Copper surface
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review
• Publication version: Published version
• Journal title: Fizika A
• Numbering: vol. 7, no. 4, pp. 205-212
• p-ISSN: 1330-0008
• URN:NBN: urn:nbn:hr:217:879355
• Publication: 1998
• Document URL: http://fizika.hfd.hr/fizika_a/av98/a7p205.htm
• Type of resource: Text
• Access conditions: Open access
• Created on: 2019-10-04 16:08:37