| Fabry-Perot resonators are widely used in scientific research and engineering tech-nology.There are two main features of such a cavity,the enhancement of the light intensity and the excellent wavelength selectivity,which have been applied in spec-troscopy,lasers,telecommunications and sensing.High-finesse fiber Fabry-Perot cav-ities also have the advantages of small size,excellent integration,direct fiber coupling,ultra-small mode volumn and good tunability.This cavity can effectively enhance the interaction between light and matter inside the cavity and can arise Purcell edffect and strong coupling.Thus fiber cavities have been integrated with different quantum sys-tems such as atoms,trapped ions,mechanical oscillator,quantum dot,colour center and so on.What’s more,fiber cavities,which belongs to the fiber sensors,are of important application value in novel sensing fields.This thesis focus on the experimental fabri-cation of ultra-high finesse fiber cavities and use the cavities in sensing and quantum information fields.The main works of this thesis are listed below:1.Design and build an experimental device based on C02 laser to machine micro-mirrors with ultra-low roughness.The machining process uses the principles of laser ablation and thermal reflow.It can fabricate ultra-smooth micro-optical components with different surface topography such as spherical mirrors,ellip-tical mirrors and lens arrays.The surface roughness of the mirror is 0.2nm which is the same order of the atom size and so it can support ultra-high reflectance coat-ing.The machined spherical mirrors have different radius of curvature ranging from 30um to 600um.2.Accomplish a set of processes to fabricate ultra-high finesse fiber cavities,in-cluding several kinds of coatings,sample characterization,building the cavity test system and the cavity length locking experiments.A cavity with finesse of 156000@739nm and with linewidth of 10MHz has been accomplished.These techniques is critical for the later applications.3.Propose and fabricate polarization nondegenerate fiber Fabry-Perot cavities with large tunable splittings up to 3.2GHz.This novel cavity realizes the operation of photon polarization degree of freedom and can be useful in several experimental systems.4.Design a new kind of in-fiber air-bubble Fabry-Perot interferometer for strain sensing.The strain sensor has high sensitivity of 56.69pm/με which is about one order of magnitude higher than the traditional ones.5.Demonstrate a fiber Fabry-Perot cavity in the ultraviolet range of 369nm,which covers the florescence wavelength for the 2P1/2 to 2S1/2 transition of Yb+ and is designed for florescence collection.Based on the measured experimental param-eters,simulation performed on the cavity and ion shows a Purcell factor better than 2.5 and a single-mode fiber collection efficiency over 10%.This technolo-gy can support ultra-bright single photon sources based on trapped ions and can provide the possibility to link remote atoms as a quantum network. |
