Heat input and accumulation for ultrashort pulse processing with high average power
-
Johannes Finger
,
Benedikt Bornschlegel
Abstract
Materials processing using ultrashort pulsed laser radiation with pulse durations <10 ps is known to enable very precise processing with negligible thermal load. However, even for the application of picosecond and femtosecond laser radiation, not the full amount of the absorbed energy is converted into ablation products and a distinct fraction of the absorbed energy remains as residual heat in the processed workpiece. For low average power and power densities, this heat is usually not relevant for the processing results and dissipates into the workpiece. In contrast, when higher average powers and repetition rates are applied to increase the throughput and upscale ultrashort pulse processing, this heat input becomes relevant and significantly affects the achieved processing results. In this paper, we outline the relevance of heat input for ultrashort pulse processing, starting with the heat input of a single ultrashort laser pulse. Heat accumulation during ultrashort pulse processing with high repetition rate is discussed as well as heat accumulation for materials processing using pulse bursts. In addition, the relevance of heat accumulation with multiple scanning passes and processing with multiple laser spots is shown.
Acknowledgments
Parts of this work have been funded by the German Research Foundation DFG under grant no. PO 591/41-1.
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©2018 THOSS Media & De Gruyter, Berlin/Boston
Artikel in diesem Heft
- Cover and Frontmatter
- Views
- Disruptive: making lenses in a foundry
- Community
- News
- Topical Issue: Ultrafast Laser Matter Interaction
- Editorial
- The ultrafast laser is gearing up to become a tool for high-precision mass production – opportunities and challenges
- Review Articles
- Ablation dynamics – from absorption to heat accumulation/ultra-fast laser matter interaction
- Heat input and accumulation for ultrashort pulse processing with high average power
- Residual heat generated during laser processing of CFRP with picosecond laser pulses
- Ultrafast Bessel beams: advanced tools for laser materials processing
- Research Articles
- Residual heat during laser ablation of metals with bursts of ultra-short pulses
- Model of the final borehole geometry for helical laser drilling
- Atomistic simulations of ultra-short pulse laser ablation of aluminum: validity of the Lambert-Beer law
Artikel in diesem Heft
- Cover and Frontmatter
- Views
- Disruptive: making lenses in a foundry
- Community
- News
- Topical Issue: Ultrafast Laser Matter Interaction
- Editorial
- The ultrafast laser is gearing up to become a tool for high-precision mass production – opportunities and challenges
- Review Articles
- Ablation dynamics – from absorption to heat accumulation/ultra-fast laser matter interaction
- Heat input and accumulation for ultrashort pulse processing with high average power
- Residual heat generated during laser processing of CFRP with picosecond laser pulses
- Ultrafast Bessel beams: advanced tools for laser materials processing
- Research Articles
- Residual heat during laser ablation of metals with bursts of ultra-short pulses
- Model of the final borehole geometry for helical laser drilling
- Atomistic simulations of ultra-short pulse laser ablation of aluminum: validity of the Lambert-Beer law
