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We realize mirror templates on the tips of optical fibers using a single-shotCO$_2$ laser ablation procedure. We perform a systematic study of the influenceof the pulse power, pulse duration, and laser spot size on the radius ofcurvature, depth, and diameter of the mirror templates. We find that thesegeometrical characteristics can be tuned to a larger extent than has beenpreviously reported, and notably observe that compound convex-concave shapescan be obtained. This detailed investigation should help further theunderstanding of the physics of CO$_2$ laser ablation processes and helpimprove current models. We additionally identify regimes of ablation parametersthat lead to mirror templates with favorable geometries for use in cavityquantum electrodynamics and optomechanics.

Optimized single-shot laser ablation of concave mirror templates on optical fibers