COMPARISON OF CONFINEMENT EFFECT IN ENHANCING SHOCK WAVE PLASMA GENERATION AT LOW PRESSURE BETWEEN TEA CO₂ AND ND-YAG LASERS ON QUARTZ SAMPLE

Rinda Hedwig¹, Tjung Jie Lie² and Hendrik Kurniawan²

¹Hardware Laboratory, Bina Nusantara University
Jl. KH. Syahdan 9, Jakarta 11480, Indonesia
²Applied Spectroscopy Laboratory, Graduate Program in Opto-Electrotechniques and Laser Applications
University of Indonesia, Jl. Tomang Raya 51G-H, Jakarta 11440, Indonesia

Abstract
An experimental study on the pre-irradiation effect observed on quartz sample reveals its origin in the failure of shock wave formation by the ablated atoms at the initial shots. The disappearance of this effect at later stages was found to be connected with the appearance of a crater of appropriate depth created by repeated irradiation on the sample surface. Experimental data show that it is the confinement effect of the crater, which is solely responsible for the generation of the secondary plasma, in conformation with the shock wave plasma model proposed earlier. Further studies show that the lateral size of the crater which is depend on the beam quality of the laser system gives prominent effect in the number of pre-irradiations before the plasma formation. It is concluded that smaller diameter and deeper crater will suppress the number of pre-irradiations.

Publication : Physics Journal IPS A5 (2002) 0203 » page of Content » send to a friend » printed version » request for hard-copy Full paper : closed license in format PDF (request for hard-copy) Contact : author(s) Additional info : 6 pages, language English » accessed 21.149 times