High-resolution monitoring of the hole depth during ultrafast laser ablation drilling by diode laser self-mixing interferometry |
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Authors: | Mezzapesa Francesco P Ancona Antonio Sibillano Teresa De Lucia Francesco Dabbicco Maurizio Lugarà Pietro Mario Scamarcio Gaetano |
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Affiliation: | Dipartimento Interateneo di Fisica, Università degli Studi e Politecnico di Bari, Bari, Italy. francesco.mezzapesa@uniba.it |
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Abstract: | We demonstrate that diode laser self-mixing interferometry can be exploited to instantaneously measure the ablation front displacement and the laser ablation rate during ultrafast microdrilling of metals. The proof of concept was obtained using a 50-μm-thick stainless steel plate as the target, a 120?ps/110?kHz microchip fiber laser as the machining source, and an 823?nm diode laser with an integrated photodiode as the probe. The time dependence of the hole penetration depth was measured with a 0.41?μm resolution. |
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