摘要(英) |
This study investigates the micro-drilling technique of circular through-holes
and dumbbell-shaped through-holes on sapphire thin substrates using an ultrafast
pulsed laser. Due to its high thermal conductivity and exceptional optical
properties, sapphire thin substrates hold extensive potential applications in
photonics, optical devices, and biomedical fields. However, the inherent hardness
and difficulty in processing sapphire material have posed challenges for
traditional mechanical drilling techniques, particularly for micro-drilling with
hole diameters below 100 micrometers. To overcome the limitations of
conventional drilling methods, this study proposes a micro-drilling approach
based on the ultrafast pulsed laser. The study employs a femtosecond laser in
conjunction with a six-axis motion platform and objective lens system for research
purposes. The femtosecond laser generates a high-energy density beam on the
sapphire thin substrate to perform micro-drilling, while the six-axis motion
platform allows for adjustment of the laser′s incident angle by changing the
platform′s orientation. Through optimization of the femtosecond laser parameters,
this study successfully achieves circular through-holes and dumbbell-shaped
through-holes on the sapphire thin substrate. The research analyzes the impact of
different laser parameters on drilling quality, including factors such as smooth
hole walls, absence of cracks, and minimal tapering. Finally, through
experimental adjustments, an appropriate parameter combination is determined,
resulting in the realization of high-quality circular through-holes and dumbbellshaped through-holes. |
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