Numerical simulation of laser ablation with cavity reflections

Early stages of nanosecond pulsed-laser growth of silicon pillars in vacuum

“…The silicon source for microcolumn growth is the laser-ablated silicon-rich vapour. A.W.Bailey et al [15] Stated that silicon-rich molecules are produced from the initially formed grooves or pits where etching is enhanced because the laser energy is concentrated as the beam undergoes multiple reflections from the steep walls. In addition, based on the presented result (see Figs.…”

Laser machining of structural ceramics—A review

“…The phenomenon of multiple reflections has been incorporated into the machining process in several ways. [44][45][46][47][48] The laser beam energy Q a absorbed …”

Superwicking Functionality of Femtosecond Laser Textured Aluminum at High Temperatures

“…As seen, in addition to common random nano/microstructures, the microgroove texture includes a large number of LIPSS areas and fine microholes with a LIPSS-textured surface. The microhole formation results from a "keyhole" effect observed after ablation with continuous wave (CW), long-pulse, and ultrashort-pulse lasers [86][87][88][89][90]. This effect is caused by the formation of microspots with enhanced laser beam absorption at some surface structures on the crater bottom that results in a higher ablation rate and the creation of a microhole that acts as a focusing cavity and further enhances the laser beam absorption due to multiple reflections [86][87][88][89].…”

“…The microhole formation results from a "keyhole" effect observed after ablation with continuous wave (CW), long-pulse, and ultrashort-pulse lasers [86][87][88][89][90]. This effect is caused by the formation of microspots with enhanced laser beam absorption at some surface structures on the crater bottom that results in a higher ablation rate and the creation of a microhole that acts as a focusing cavity and further enhances the laser beam absorption due to multiple reflections [86][87][88][89]. It has been previously found that the formation of random deep microholes at the crater bottom following static multipulse femtosecond laser ablation is observed at laser fluences above ~3 J/cm 2 [88].…”