Wavelength Shift in Erbium-doped Glass microspherical Whispering Gallery Mode Lasers

http://www.iop.vast.ac.vn/activities/5-8April/Proceedings_IWPA2004/proceeding_IWPA_2004.htmlInternational audienceWe have succeeded in continuous-wave laser oscillation on 4I13/2 → 4I15/2 transition of Er3+ ions around 1550 nm in microspheres fabricated with Erbium doped fluoride ”ZBLALiP” and phosphate ”Schott” glasses. The microsphere lasers have been studied under pumping at 1480 nm. Whispering Gallery Mode laser spectra were analyzed for different sphere diameters. Wavelength Red-shift effect of both fluorescence and laser spectra was experimentally observed in Er3+ doped phosphate glass when the pump power was increased, originating from thermal effects. We showed coupling effect between microspherical laser and an external cavity made by a metallic mirror. We observed line shift to lower wavelengths due to optical feedback effect. A general overview of the current state of the art in microspheres is given as well as a more general introduction