Student Novel biburst ultrafast laser ablation: burst-in-burstWednesday (24.06.2020) 10:20 - 10:40 Room 1
Laser micro-machining by ultrafast light pulses is an attractive technique due to confined laser-matter interaction area and pulse duration shorter than electron – phonon thermalisation time, which results in high processing quality. However, competition in industrial applications demands growth of processing efficiency every year. In our previous works, the laser ablation efficiency versus various processing parameters like laser fluence, beam scanning speed, pulse repetition rate, hatch distance, number of pulses per MHz burst was studied and beam-size-optimization was introduced. In this work we investigated the novel laser biburst mode, where set of 4.88 GHz burst pulses can be burst again at 64.5 MHz. The biburst mode and tratitional burst mode operation will be compared in the case of metals ablation efficiency.
Femtosecond laser (Pharos, Light Conversion) with possibility to produce biburst pulses with repetition rate of 64.5 MHz or/and 4.88 GHz was used to structure metal samples. To maximally exploit the available energy of laser irradiation and reach the highest material removal rate the beam-size optimisation of ablation process was performed. Ablation efficiency and quality was studied by varying number of pulses per burst in conventional burst regimes for 64.5 MHz and 4.88 GHz burst, and in the biburst mode – both simultaneous separation of 64.5 MHZ and 4.88 GHz. The role of processing method (cavity milling and crater punching) to ablation efficiency will be discussed in the presentation as well.
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