Investigation of intrinsic properties of high-quality fiber Fabry–Perot resonators

Fiber Fabry-Perot (FFP) resonators of a few centimeters are optimized as a function of the reflectivity of the mirrors and the dimensions of the intra-cavity waveguide. Loaded quality factor in excess of 10⁹, with an optimum of ~4 × 10⁹, together with an intrinsic quality factor larger than 10¹⁰ and intrinsic finesse in the range of 10⁵ have been measured. An application to the stabilization of laser frequency fluctuations is presented.