Designing And Researching On Multi-component Glass Based Microsphere Laser

Whispering gallery mode microcavity possesses significant advantages of high quality factor?Q factor?,simple structure,small size,small mode volume and integration available above the silicon wafer.For the reasons above,whispering gallery mode microcavity can be used in various fields including integrated photonics,low threshold laser,high sensitivity biosensor and cavity photo-mechanics.The microsphere,based on whispering gallery mode,has the features of high Q factor and easy processing,which is the hotspot of both low threshold micro-laser and high sensitivity sensor research fields.This thesis takes high performance whispering gallery mode microcavity laser as target,surrounds two aspects of properties containing single mode operate and multiband laser emission,and develops the researches of active whispering gallery mode microsphere designing,fabrication and high performance laser emission based on theory and experiment.The specific research contents comprise several aspects which are shown as follows:1.Designing and fabrication of high Q factor active whispering gallery mode microcavity.This thesis analyzes the main microsphere parameters,mode distribution in microsphere,high coupling efficient and laser performance of microsphere in theory research,constructs the experiment platform optical whispering gallery mode microcavity and develops the experiments of microcavity coupling and testing through various kinds of high Q factor microsphere fabrication methods.The preliminary laser experiments have been developed by Er³⁺/Yb³⁺co-doped phosphate glass microcylinder and microsphere with different Q factors.Then,stable 1.5?m band multimode laser signals have been detected.High performance laser emission is determined by many factors including Q factor,gain coefficient the coupling status of the pump laser.This research part establishes the foundation of theory designing,preparation and processing and experimental exploration for the follow-up high performance microsphere laser.2.Designing and researching of single mode whispering gallery mode microsphere laser operation.The existence of complex higher order modes in whispering gallery mode microspheres cause multimode microsphere laser emission.The microsphere with 10⁶ Q factor has been made by Er³⁺/Yb³⁺co-doped phosphate glass.Through two experimental schemes including enhancing sphericity and designing compound microsphere by two gain microspheres,single mode laser has been effectively realized with the 1.8 MHz linewidth.The edge mode rejection ratio is 42.78 dB with the threshold of 100 watts scale,which effectively improve laser quality of whispering gallery mode microsphere laser.3.Designing and researching of multiband whispering gallery mode microsphere laser emission.Whispering gallery mode microsphere laser with multiband emission can enhance the application fields of microsphere laser.Based on different rare earth ions doped glass microsphere,microsphere laser with different bands can be detected.In experiment,laser signals located in 1.0?m band,1.5?m band and 2.0?m band have been achieved by Yb³⁺doped phosphate glass,Er³⁺/Yb³⁺co-doped phosphate glass and Tm³⁺doped germanate glass.Meanwhile,1.0?m band laser emission can be realized from silica glass microsphere by Stimulated Raman Effect.Furthermore,the congruent melting microsphere fused by different kinds of active glass has been explored,which can in the hope of realizing multiband laser emission from one microsphere.Multiband laser emission based on different rare earth ions doped glass and optical nonlinear effect overwhelmingly enrich microsphere laser emission bands and relevant application fields.