High efficiency GHz laser processing with long bursts. (1st March 2023)

• Record Type: Journal Article
• Authors: Audouard, Eric; Mottay, Eric
• Is Part Of: International journal of extreme manufacturing. Volume 5:Number 1(2023)
• Publication Date: 2023-03-01
• Subjects: femtosecond laser -- temporal pulses shaping -- GHz bursts -- femtosecond processing; Manufacturing processes -- Periodicals; Manufacturing processes -- Technological innovations -- Periodicals; 670
• DOI: 10.1088/2631-7990/aca79f
• Languages: English
• ISSNs: 2631-7990

Abstract

Abstract: Bursts of GHz repetition rate pulses involve more ablation mechanisms than single femtosecond pulses. Efficient ablation by GHz laser pulses is a multi-step process, consisting of a first thermal incubation phase, followed by a highly efficient ablation phase. GHz ablation therefore combines thermal and non-thermal ablation mechanisms. With an optimal choice of the burst duration, the ablation efficiency can be highly enhanced. Long bursts, comprising tens of pulses to hundreds of pulses, are needed to take full advantage of the increase in ablation efficiency. Highlights: GHz femtosecond laser processing offers the potential to significantly increase the ablation efficiency of ultrafast laser material processing. GHz laser processing consists of a multi-step ablation process: A first thermal incubation phase, followed by highly efficient thermal and non-thermal ablation. Long bursts of tens of pulses to hundreds of pulses are key to achieving high ablation efficiency.