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Ultrashort pulse laser welding of glasses without optical contacting

: Richter, S.; Zimmermann, F.; Sutter, D.; Budnicki, A.; Tünnermann, A.; Nolte, S.


Heisterkamp, A. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Frontiers in Ultrafast Optics. Biomedical, Scientific, and Industrial Applications XVII : 29 January - 2 February 2017, San Francisco, California, United States
Bellingham, WA: SPIE, 2017 (Proceedings of SPIE 10094)
ISBN: 978-1-5106-0629-6
ISBN: 978-1-5106-0630-2
Paper 1009411
Conference "Frontiers in Ultrafast Optics - Biomedical, Scientific, and Industrial Applications" <17, 2017, San Francisco/Calif.>
Fraunhofer IOF ()

We report on ultrashort pulse induced welding of fused silica without previously optical contacting of the samples. We used a TruMicro 2020 by TRUMPF delivering bursts of intense ultrashort laser pulses with an individual pulse energy of up to 10 μJ, an intraburst pulse separation of 20 ns and a burst repetition rate of 200 kHz. With this setup we could realize a large pool of molten material with a length of up to 450 μm and a diameter of around 160 μm. If the laser focus is placed near the surface of a glass sample the low viscosity of the hot material induces bulging of the surface and ejection of the molten material. This molten material can be used to fill a gap of up to 3 μm between fused silica samples. We also determined the breaking strength with a three-point bending test. The determined maximal value of 73 MPa is equivalent to 85% of the stability of the pristine bulk material.