Study Of Phosphosilicate Microsphere Cavity Laser

Microsphere cavity with the special whispering gallery modes(WGM)that posses a high quantum factor and small volume.It is favorable to the study of low-threshold microsphere laser and nonlinear optics.This work adopted the coupling system of fiber and microsphere to study the rear earth ions doped phosphosilicate microsphere laser and phosphosilicate Raman laser.In the experiments,rear earth ions doped phosphosilicate microsphere was fabricated with the high temperature melting method.Rear earth ions and phosphosilicate microsphere worked as the gain medium and resonant.The fiber taper with high coupling efficiency up to 99%is used as the optical coupler,that couples the laser light into or out of the microsphere.In order to study the phosphosilicate microsphere laser,a 976nm semiconducter laser was used as pumping source and the luminescence characteristics of rear earth ions doped phosphosilicate microsphere was explored.(1)The Yb3+-Er3+co-doped phosphosilicate microsphere was pumped by the source,a high power single-mode laser oscillation at 1545.46nm with the output power of 48.98?W and multi-mode lasers from 1535.80nm to 1566.63nm within C band were obtained,which were generated from the 4I13/2?4I15/2 transitions of Er3+ ions.In addition,the green up-conversion luminescence was also obtained with the wavelength of 521.2nm,532.0nm(Er3+:2H11/2?4I15/2)and 544.2nm(Er3+:4S3/2?4I15/2).(2)The up-conversion luminescence properties of the Yb3+-Tm3+co-doped phosphosilicate microsphere were studied.The strong blue light at 477.3nm and weak red luminescence at 648.9nm were detected,which correspond to 1G4?3H6 and 1G4?3F4 transitions of Tm3?ions,respectively.(3)The down-conversion laser and nonlinear effect of the Yb3+ doped phosphosilicate microsphere were studied.Both the down-conversion single-mode laser at 1058.26nm(Yb3+:2F5/2?F7/2)and various self-stimulated Raman laser that extends the wavelength to O band were acquired in this experiment.The self-stimulated Raman laser was interpreted by the down-conversion laser of the Yb3+ doped phosphosilicate microsphere.(4)The luminescence characteristics of Yb3+ doped phosphosilicate microsphere were explored.Bright blue luminescence at 476.lnm was obtained in this doped microsphere,which was generated by the cooperative luminescence of excited Yb3+ ion-pairs with 11.9nm blue shift.Due to the characteristics of good chemical stability,bigger Raman shift and high phonon energy,the phosphosilicate material has a great advantage to realize the down-conversion laser.The self-stimulated cascaded Raman laser can be realized effectively with zero dispersion in O band of the optical fiber communication,that would be of great application value for the fabrication and study of O band lasers and amplifiers.