Abstract
We present the optical characterization of single light emitting glass microspheres by means of an experimental setup that combines μ-transmission and μ-photoluminescence measurements without the need of optical fibers for excitation or detection purposes. We demonstrate that the results provided by both techniques are consistent among them and can provide complementary information regarding the active material properties (material losses and cross sections) and the passive resonator ones (radiative quality factors, group refractive indices, sphere radius, and pump power threshold for mode spectral shifting). This work addresses Nd3+ doped borate glass microspheres, but the reported studies could be realized in other rare-earth-doped glass microspheres as well.
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