Avoiding the requirement for pre-existing optical contact during picosecond laser glass-to-glass welding

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Abstract

Previous reports of ultrafast laser welding of glass-to-glass have
indicated that a pre-existing optical contact (or very close to) between the
parts to be joined is essential. In this paper, the capability of picosecond
laser welding to bridge micron-scale gaps is investigated, and successful
welding, without cracking, of two glasses with a pre-existing gap of 3 µm is
demonstrated. It is shown that the maximum gap that can be welded is not
significantly affected by welding speeds, but is strongly dependent on the
laser power and focal position relative to the interface between the
materials. Five distinct types of material modification were observed over a
range of different powers and surface separations, and a mechanism is
proposed to explain the observations.
Original languageEnglish
Pages (from-to)18645
JournalOptics Express
Volume23
Issue number14
DOIs
Publication statusPublished - 13 Jul 2015

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