Nanosecond and sub-nanosecond pulsed laser ablation of thin single and multi-layer packaging films

Modeling of Thin-Film Single and Multilayer Nanosecond Pulsed Laser Processing

“…The simulated curve displays a small peak in ablation depth at 5 J/cm , corresponding to a brief window of combined vaporization and phase explosion prior to significant onset of, and shielding from, the latter. Reasonable agreement with the experimental results of [34], obtained with the same laser wavelength and pulse duration, are shown in Fig. 4.…”

“…As discussed in Ref. [34], this effect is due in part to lower beam shielding by the ablation products at 515 nm than at 1064nm. The effect of pulse duration, in this case, is found to be of lesser influence than wavelength; however, the simulation can potentially be utilized to investigate the effects of both parameters independently.…”

“…Boundary type 2 may be further subdivided into those resulting from change of state (type 2 a) and those resulting from material removal (type 2 b). Type 2 a is an intermediate • Experimental AL Cut [34] Simulated …”

“…The model and all results have been developed in MATLAB. Material removal of plastics is determined using data in literature [32][33][34] and will not be discussed here.…”

“…The first case, progressive ablation, is calculated for metals based on the single pulse model with corresponding initial temperature Tj and effective incident laser intensity /Q. Experimental data are utilized for plastics [32][33][34]. To avoid unnecessary duplicate tasks and to reduce computational time, a library of ablation depth data is produced and stored separately.…”