Fabrication of a centimeter-long cavity on nanofibe for strong-coupling regime of cavity QED

We report the fabrication of a centimeter-long cavity directly on the nanofibe using femtosecond laser ablation. The cavity can operate in both “strong-coupling” and “Purcell” regime of cavity QED with moderate finesse high cooperativity and high transmission. The high optical quality of the cavity modes show promising avenues for fibe-based quantum interface and single photon sources.