Efficient and robust free-space light coupling in integrated systems is a challenging task for photonic devices. Here we propose a femtosecond laser process combined with CW laser thermal reflow for manufacturing a fiber-to-fiber free-space light-coupling device in fused silica. The monolithic free-space coupler design consists of two fiber holders and two ball lenses, used to achieve both, fiber-output collimation and fiber-injection. The device proved to efficiently work at 633 nm for single mode fiber coupling, which can be extended beyond the whole visible range with a simulated maximum efficiency of up to 90-95% of coupling.
We study the propagation of coherent broadband light through laser induced periodic surface structures (LIPSS) fabricated in diamond, by comparing the performance of the laser generated nanostructures with sinusoidal ideal structures in the near-IR. The simulations were carried out for a variety of LIPSS morphologies, including nanostructure aspect ratio and the irregularities arising from the LIPSS technique. The results show that these irregularities produce substantial diffraction compared to the ideal structures, meaning that their use for some optical applications may be limited.
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