Abstract
In this study, we present results on direct fiber surface ablation using UV femtosecond laser pulses (206 nm, 50 kHz, 210 fs). The research is carried out experimentally and simulatively. The simulative experiment demonstrates that fringe visibility is best when half of the fiber core is removed. The fringe free spectral range (FSR) decreases as the trench length increases. The experimental study contains the investigation on parameter optimization for trench-like surface formation on the fiber via direct laser ablation, suitable for Mach – Zehnder interferometer (MZI) formation. Linear light absorption allows to fabricate deep, regular structures on the fibers with small (148 ± 12 nm) bottom surface roughness.
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