Research On Multi-Core Photonic Crystal Fiber Laser And Surface Plasmon Resonance Sensor With Photonic Crystal Fiber

The Photonic crystal fiber (PCF) has attracted more attentions for its flexiblestructure design and excellent optical performance, and it has become a new focus inthe fiber optical research domain, particularly prominent in the research areas of fiberlaser and fiber sensor. In this dissertation, multi-core PCF laser and grapefruit-typePCF sensor based on surface plasmon resonance technology are theoretically andexperimentally investigated. The characteristics of mode field distribution andtemperature distribution in multi-core PCF laser are numerically simulated by finiteelement method; The in-phase supermodel selection and vertical temperaturedistribution of the18core PCF lasers are studied experimentally. The surface plasmonresonance sensing properties based on grapefruit-type PCF are numerically simulatedand the PCF-SPR sensor experiment based on silver film plating has been carried out.The main work and innovations are summarized as follows:1. The mode coupling principle and supermodel distribution characteristics ofmulti-core PCF laser are theoretically analyzed; The supermodel distributioncharacteristics of multi-core PCF laser based on the structure of16cores rectangulararray，18cores circular array and19cores circular array are numerically simulatedrespectively with the finite element method.2. The coupling system for the PCF laser is analyzed and the coupling process isdesigned based on visual Basic program; The efficient1:1space coupling is achievedby the coupling system which is consisted of two aspheric lens; The near-fieldobservation device which is used to immediately observe the near-field pattern of the18-core PCF laser is designed by using a microscope objective lens and CMOS imagesensor; The in-phase supermodel of18core PCF laser is selected experimentallythrough small holes election technology, The14.85W laser with single wavelength of1037nm is achieved when the pumping power is33.75W.3. The thermal properties in multi-core PCF laser with the structure of singlecore,18-cores and19-cores are analyzed with full-vector fnite-element method. Thetemperature sensing technique based on fiber Bragg grating sensor array is proposedto measure the longitudinal temperature distribution, and the three-Dimensionalthermal properties of18-cores PCF lasers operated under natural convection are investigated.4. The surface plasmon resonance sensing properties of PCF based on differentgrapefruit-type structures are numerically simulated; The influence of the metaldielectric-filled method with silver film, silver nanowires and mixed mode are studied;The silver-film coating experiments in the inner wall of grapefruit-type PCF is carriedout and the PCF-SPR characteristics are investigated.