Abstract

Copper (Cu) nanoparticles (NPs) are synthesized under the near-surface region of the Nd:Y₃Al₅O₁₂ (Nd:YAG) crystal by direct Cu⁺ ions implantation. Subsequently, the monolithic ridge waveguide with embedded Cu NPs is fabricated by C⁴⁺ ions irradiation and diamond saw dicing. The nonlinear optical response of the sample is investigated by the Z-scan technique, and pronounced saturable absorption is observed at the 1030 nm femtosecond laser. Based on the obvious saturable absorption of Cu NPs embedded Nd:YAG crystal, 1 µm monolithic mode-locked pulsed waveguide laser is implemented by evanescent field interaction between NPs and waveguide modes, reaching the pulse duration of 24.8 ps and repetition rate of 7.8 GHz. The work combines waveguides with NPs, achieving pulsed laser devices based on monolithic waveguide chips.

© 2021 Chinese Laser Press

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