Abstract
Abstract Nd:YAG crystal is one of the major gain media used in high-power solid-state laser systems. In this work, the single-line waveguides with Type Ⅰ modification have been fabricated in Nd:YAG crystal by femtosecond laser writing. The waveguides show good guiding properties in both TE and TM polarizations, which is different from the well-developed Type II structures. The high-resolution confocal micro-photoluminescence and micro-Raman spectra images obtained by scanning the cross-section of the track region certify a positive refractive-index change induced in femtosecond laser irradiated region. The fluorescence properties remain 82% in the waveguide region, which shows the potential for active photonic devices.
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