Experimental Research Of Light-induced Atomic Desorption And Rubidium Loading In Hollow-core Photonic Crystal Fiber

As a unique photonic crystal fiber,the hollow-core photonic crystal fiber has the advantages of low transmission loss and controllable dispersion due to the photonic band gap and hollow-core structure,so it is widely used in various fields.In particular,the hollow-core structure provides the possibility to fill the hollow-core photonic crystal fiber with alkali atom gas.For example,filling the hollow-core photonic crystal fiber with cesium atoms can realize single-photon level optical storage.However,the density of alkali atoms in the optical fiber medium cavity is relatively low,which requires the use of light-induced atomic desorption to increase the optical depth in the atomic medium cavity.In this work,the experimental research of light-induced atomic desorption was carried out in the rubidium vapor cell,and it was found that atomic density increased due to the effect of light-induced atomic desorption and photo thermal effect.With the increase of the desorption light power,the two effects gradually approached,and the combined effect further increased the atomic density.At the same time,in order to enhance the effect of light-induced atomic desorption,porous glass was fired based on the filling method in the experiment and packaged in a homemade vapor cell.In addition,two sets of hollow-core photonic crystal fiber rubidium loading systems were designed in this thesis.The design of dual-port cavity and fiber fixing splint was used to optimize the loading process of rubidium atoms in hollow-core fiber.This can be of great significance to the research of all-fiber atomic photonic devices.