Dynamics of double plume emissions in TEA-CO/sub 2/ laser ablation of graphite

Streak photography of TEA-CO/sub 2/ laser ablation of graphite in helium (He) and argon (Ar) background gases shows two luminous fronts, that are spatially and temporally separated, lifting off the graphite target. The velocity profile of the second front appears to follow closely that of the first...

Full description

Saved in:
Bibliographic Details
Published inIEEE transactions on plasma science Vol. 31; no. 6; pp. 1299 - 1304
Main Authors Wee-Ong Siew, Teck-Yong Tou, Seong-Shan Yap, Kah-Hieng Wong, Oi-Hoong Chin
Format Journal Article
LanguageEnglish
Published IEEE 01.12.2003
Subjects
Absorption
Argon
Computer displays
Gas lasers
Gases
Laser ablation
Photography
Spectroscopy
Stimulated emission
Online AccessGet full text

Cover

More Information
Summary:Streak photography of TEA-CO/sub 2/ laser ablation of graphite in helium (He) and argon (Ar) background gases shows two luminous fronts, that are spatially and temporally separated, lifting off the graphite target. The velocity profile of the second front appears to follow closely that of the first luminous front. The second front is absent if the laser-supported absorption wave sets in when the background gas pressure is increased to 50-mbar Ar. The optical emission spectroscopy display many of triply, doubly, and singly ionized carbon species in the expanding plume at <0.3 mbar He, while the excited and singly ionized helium species are found in (1-30) mbar He which coincides with streak observations of strong luminous fronts. Computer simulations of the propagation trajectories of luminous fronts are carried out using the blast-wave, drag, and the snowplow models.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2003.821359