Comparison of nanosecond laser ablation at 1064 and 308 nm wavelength |
| |
Authors: | L. Torrisi, S. Gammino, L. And , V. Nassisi, D. Doria,A. Pedone |
| |
Affiliation: | a Dipartimento di Fisica di Messina, 98128, Messina, Italy b INFN-Laboratori Nazionali del Sud (LNS), 95124, Catania, Italy c Dipartimento di Fisica di Lecce, Laboratorio di Elettronica Applicata (LEA), 73100, Lecce, Italy d INFN sez. di Lecce, 73100, Lecce, Italy |
| |
Abstract: | To study the solid Cu ablation in vacuum, two different laser sources operating at 1064 and 308 nm wavelength are employed at similar values of laser fluences. The infrared laser is a Q-switched Nd:Yag having 9 ns pulse width (INFN-LNS, Catania), while the ultraviolet one is a XeCl excimer having 20 ns pulse width (INFN-LEA, Lecce). Both experiments produced a narrow angular distribution of the ejected material along the normal to the target surface. The ablation showed a threshold laser power density, of about 7 and 3 J/cm2 at 1064 and 308 nm, respectively, below which the ablation effect was negligible. The laser interaction produces a plasma at the target surface, which expands very fast in the vacuum chamber. Time-of-flight (TOF) measurements of the ion emission indicated an average ion velocity of the order of 4.7×104 and 2.3×104 m/s for the infrared and ultraviolet radiation, respectively. We also estimated approximately the corresponding temperature of the plasma from which ions originated, i.e. about 106 and 105 K for IR and UV wavelength, respectively. A discussion of the analysis of the ablation mechanism is presented. At the used laser power densities the produced Cu ions showed ionisation states between 1+ and 5+ in both cases. |
| |
Keywords: | Pulsed laser irradiation Laser plasma Time of flight Ion beam |
本文献已被 ScienceDirect 等数据库收录! |
|