Spectral Performance of Yb3+-Doped Silica Fiber for 1018 nm Tandem-PumpingTechnology

The absorption spectra were measured by a PerkinElmer Lambda 950 spectrophotometer with the wavelength range of 190-1200 nm and a scan step of 1 nm. The fluorescence spectra were measured by a FLS920 fluorescence spectrometer with a xenon lamp at 896 nm as the excitation source and a scan step of 1 nm.

The extra-red absorption spectra of the glass samples were measured by a Nicolet 6700 Fourier spectrometer. The Raman spectra were measured by a Horiba LabRAM HREvolution Raman spectrometer with a wavelength range of 200~1500 cm-1 and an excitation wavelength of 633 nm. The 2D-HYSCORE spectra of the samples were measured with a Swiss Bruker E580 pulsed EPR detector at 4K.