MANUFACTURING with short pulse lasers
FOCUS
Figure 5.( a) Microscope images of holes drilled with repetitive single pulses( left) and with GHz-bursts( right) in soda lime glass; note that all other laser parameters are identical( pulse energy, pulse duration, repetition rate, drilling time).( b) Microscope images of a matrix of TGVs in 75 µ m thick fused silica seen from the top, inlet( left), and from the bottom, outlet( right).
processing without any use of chemicals and opens the path to a more efficient and more durable production method of TGV with a lower impact on the environment.
CONCLUSION The GHz-burst mode is still a relatively new technology, and many processes such as milling, surface structuring, and welding of glasses have barely been investigated. Combining the temporal beam shaping by GHz-bursts together with spatial beam shaping into a Bessel-beam has a huge potential not only for cutting, but also for drilling. Very recently, the formation of narrow channel through holes in glass was demonstrated by applying single GHz-bursts. The ability of such a process for chemical-free“ on-thefly” drilling has an enormous potential for industrial applications. For metals, bandgap materials as well as other materials such as ceramics, burst mode processing offers the capability to completely new process regimes and wider process windows. Since surface characteristics as well as energy efficiency and throughput can be tuned independently via the parameters used, multi-step processing with intermediate switching between these different process regimes is becoming more standard in industry. More detailed information about burst processing of metals and bandgap materials can be found in Chapters 16 and 17, respectively, of a recent book [ 6 ].
REFERENCES
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[ 6 ] Scaling of Laser Processing, Making Light Matter, edited by J. Bonse and A. F. Lasagni, Springer Nature, Part of the book series: https:// link. springer. com / series / 624 / books( SSOS, volume 257)( 2026), Chapters 16 and 17
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