Abstract
We fabricate a buried channel waveguide in neodymium-doped phosphate glass using a double line
approach by femtosecond laser writing. Raman spectra reveal an expansion of the glass network in the laser
irradiated region. Given the stress-induced positive refractive index change, waveguiding between two
separated tracks is demonstrated. The refractive index difference profile of the waveguide is reconstructed
from the measured near-field mode. Propagation loss is measured by scattering technique. Microluminescence
spectra reveal that the Nd3+ fluorescence property is not significantly affected by waveguide formation
process, which indicates that the inscribed waveguide is a good candidate for active device.
© 2013 Chinese Optics Letters
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