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A Renewable Idea<\/strong><\/p>\n 50 years passed. A research group from the Bilkent University in Ankara (Turkey) uses this idea of ablation cooling with the objective to interpret a new phenomenon of laser-matter interaction they have just observed, leading to greater ablation efficiency. At low average power and moderate repetition rate, the amount of heat accumulated with femtosecond pulses is negligible. But with a higher repetition rate, of the order of GHz, the heat in the material is greatly increased with no need to use a high energy laser. Usually, this heat leads to a degradation of the cutting or drilling quality. Yet in the GHz case, an original mechanism is set up. The generated heat, after having contributed to the increase of the ablation efficiency, is evacuated by a mechanism like the one that protected the Apollo capsule.<\/p>\n <\/p>\n Promising Results For Industrial Applications<\/strong><\/p>\n In partnership with the CELIA-Bordeaux, we tested this idea by using our Amplifier platforms (Satsuma and Tangor) and incorporating a specific GHz burst source. We ended with amazing results:<\/p>\n ><\/span> we broke a new ablation-rate record (42.3 \u00b5m3\/\u00b5J or 2.5 mm3\/min\/W) for silicon, a material used in many industrial applications, In the end, we experimentally demonstrated that silicon ablation with high efficiency and better quality is obtained using a burst with 200 pulses at 0.88 GHz repetition rate.<\/p>\n Fig.1:\u00a0Illustration of a GHz burst (200 pulses with 10 \u00b5J pulse energy, and 2 mJ of burst energy)<\/em><\/p>\n <\/p>\n![\"\"](\"https:\/\/amplitude-laser.com\/wp-content\/uploads\/2019\/08\/GRAPH-300x225.png\")
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\n><\/span> molten material was negligible compared to the volume ablated (less than 3% for a burst energy more than 10 J\/cm2)<\/p>\n
![\"\"](\"https:\/\/amplitude-laser.com\/wp-content\/uploads\/2019\/08\/Image-comparaison-300x93.png\")
More Efficiency and More Precision<\/strong><\/p>\n