Journal
OPTICS AND LASER TECHNOLOGY
Volume 120, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2019.105720
Keywords
Microwelding; Ultrafast laser; Glass; Silicon
Categories
Funding
- National Key Research and Development Program of China [2017YFB1104500]
- Young Innovative Talents Project in Universities of Guangdong Province [2018KQNCX057]
- Science and Technology Project of Guangdong Province [2014B010131004, 2014B010124002, 2014B090903014, 2015B090920003, 2016B090917002, 2016B090926004, 201604040006, 2016A030313456]
- Guangdong Provincial Key Laboratory of Industrial Ultrashort Pulse Laser Technology
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In the present work, a direct bond between glass and silicon with optical contact was formed by 515 ran picosecond laser controlled by the galvanometer scanning system. A crack-free welding effect without edge breakage and residues was obtained with breaking strength as high as 122 MPa. New crystalline phase (SiO2) was produced and silicon and oxygen have a spatial distribution gradient in the welding area analyzed by XRD and EDS, respectively, revealing that mixing and inter-diffusion of substances have occurred during laser irradiation. The transmission of near infrared light in the welding area is significantly increased compared with the non-welding area analyzed by inverted microscope. A confocal laser scanning microscope was used to observe the morphology and width of welds, which variation trend of axial focal positions is consistent with the teardrop structure produced by nonlinear absorption effect. Scanning speeds and laser repetition frequencies also affect the width and morphology of the weld.
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