Comparison of different processes for separation of glass and crystals using ultrashort pulsed lasers
2014
We investigate cutting of transparent materials using ultra short laser pulses with pulse durations in the sub to a few ps
regime. All compared methods base on nonlinear absorption including ablation cutting and cleaving or selective etching
supported by laser induced modification inside the bulk material. For most of the experiments samples of hardened glass
(Corning Gorilla®) with thickness up to 700 μm were used, ablation cutting of sapphire is presented additionally.
Absorption and modification inside the volume is analyzed in detail, aiming for tailored modifications. Besides optical
microscopy a pump probe setup was used. We show results of time resolved absorption measurements of 6 ps pulses
focused into the volume. We observe shielding due to the interaction region and accumulation effects influencing the
modifications. First results on inscribing and cutting by using beam shaping indicate the importance of tailoring the
shape and arrangement of the pulses temporally and spatially. The results presented for the different cutting methods
supports an assessment of the individual potential and a selection of the applicable method based on the requirements.
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