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Internal structuring of transparent materials using ultrashort laser pulses enables a plethora of applications. This includes precise cutting, welding but also the realization of various photonic components like waveguides, artificial birefringent devices or Bragg gratings.
The absorption of ultrashort laser pulses at high repetition rates leads to heat accumulation within the irradiated material [1]. Thereby, the focal region as well as a well-defined vicinity of the surrounding material is molten. This method can be used for local bonding of transparent materials [2]. Figure 1 a) shows a top view of laser molten material within fused silica. Within the traces of the...
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