Gain/loss spectra in ytterbium-erbium doped bulk glass samples have been investigated within spectral range of 1.5 μm. Experimental methods for determination of the population of excited metastable level, gain/loss spectra, and their variations versus pump power have been developed. A comparison of the experimental and calculated gain/loss spectra has been done.
The partial polarization of luminescence in phosphate and silicate erbium glasses in the range of 1.5 μm under the stimulation by the linearly polarized laser light (532 nm, 790-990 nm) has been detected. The degree of polarization depends both on a spectral range of excitation and on a spectral range of registration, reaching maximum value ~1%. The concentration of depolarization has been studied.