Dual wavelength Er3+: ZBLALiP whispering gallery mode laser

We present results on the realization of a dual wavelength micro-spherical glass laser source fabricated from the Erbium doped fluoride glass ZBLALiP. The pump wavelength (1480 nm) is close to that of the laser field (~1550 nm) and we use a half taper to couple both fields in and out the micro-spherical laser. The coupling by two half tapers on the same micro-spherical resonator allows two single mode laser emissions to be obtained simultaneously. The spectral interval between the two lasing wavelengths is function of the two coupling devices. By measuring the linewidth evolution versus pump power for both emissions we show their independence. We also study the lasers characteristics (i.e. emitted power and linewidth evolution) of this dual-wavelength emitter just above the threshold.