Rare Earth Ions Doped Silica Glass And Fibe Based On Sodium-borosilicate Glass Phase-separation Technology

The rare earth ions doped fiber lasers are highly valued because of its broad applications in industry,science and national defense.The rare earth ions doped fiber is the key part of the fiber laser.At present,many materials can be used to prepare rare earth ions doped optical fiber,including crystal,phosphate glass,fluoride glass,tellurite glass,silica glass and ceramics.The silica glasses have excellent mechanical strength,physical and chemical stability and low loss,making it have great potential in manufacture rare earth ions doped fiber lasers.Currently the well-known method of preparing active fiber is the modified chemical vapor deposition?MCVD?.However,the method has some drawbacks such as low doping concentration,the difficulty of controlling uniformity of doping ions,which is difficult to meet with the size requirement of large-mode fiber.The nanoporous glass with high homogeneity and large surface area based on glass-phase technology can tolerate high rare earth ions,realizing high doping concentration of rare earth ions and high homogeneity.Furthermore,the size of glass rod is controllable.It is an ideal candidate in preparing high doping concentration and large mode silica fiber.This work aims to prepare rare earth ions doped silica rod based on glass-phased technology,optimize composition,spectroscopic properties and preparation processes.Select the excellent glass rod with high quality as core glass to make preform,draw optical fiber,test and evaluate the optical performance of fibers.The work includes the following three main sections:literature summarizations;the preparation process of glass rod and spectroscopic properties measurements.At last we prepare and test the silica glass and the active double-cladding silica fiber(Tm³⁺,Yb³⁺,Er³⁺),which core is based on glass phased technology.This work first introduced the properties of rare-earth ions and the doped glasses;then introduced the active and double-cladding fiber;thirdly discussed the properties,prepare technology and development prospect of the nanoporous glass.The work then introduced the preparation of nanoporous glass,including the heating phase,hot acid leaching,decreasing OH content and impurities,solution doping and sintering technology in section 2.Furthermore,the spectroscopic properties measurements of the rod and relevant theoretical and calculation was also introduced.Based on glass-phases technology,the Tm³⁺doped silica glass and fiber were prepared.The technology of decreasing OH and the effect of OH content on 1.8?m fluorescence of Tm³⁺was introduced.To evaluate the spectroscopic properties of Tm³⁺,the J-O parameters,the emission cross-section and the gain was calculated.The high doping concentration and high homogeneity was realized in Tm³⁺doped double-cladding fiber,and the1.8?m fluorescence was observed.The Yb³⁺doped double-clad silica glass fiber was prepared,the laser output at1074nm was obtained and the slope efficiency is up to 64.5%.The Er³⁺/P⁵⁺/Al³⁺co-doped silica glass was prepared.The spectroscopic properties of Er³⁺were discussed with introducing P⁵⁺and Al³⁺.The FWHM at 1535nm was up to 74nm.At last,the up-conversion emission of Yb³⁺/Tm³⁺co-doped glasses were analyzed.Based on the optimum concentration of Yb³⁺/Tm³⁺,the Yb³⁺/Tm³⁺co-doped silica fiber was prepared.The intense blue emission was observed,making a new idea for the development of blue laser.