86 GHz Q-switched mode-locked waveguide lasing based on LiNbO3 crystal embedded Cu nanoparticles

• DOI: 10.1364/ome.9.003808
• Publication Date: 2019-08-29T14:03:07Z
• Authors: Shixiang Wang; Chi Pang; Ziqi Li; Rang Li; Ningning Dong; Qingming Lu; Feng Ren; Jun Wang; Feng Chen
• Keywords: Saturable absorption; Q-switching; Waveguide; Cladding (metalworking)

We report on the synthesis and features of copper (Cu) nanoparticles (NPs) embedded into LiNbO3 crystal. A linear optical absorption that peaked at 613 nm is observed, which correlates to localized surface plasmon resonance (LSPR) effect. In addition, Cu NPs (CuNP:LN) possesses ultrafast saturable properties a wavelength 1µm. Based these enhanced nonlinear properties, CuNP:LN applied as absorber (SA) for pulsed laser generation in waveguide system. Under an pump, 8.6 GHz fundamentally Q-switched mode-locked operation has been efficiently implemented based Nd:YAG cladding fabricated by femtosecond writing. The measured pulse duration short 55 ps slope efficiency up ∼22.7%. This work suggests promising application crystal ultrashort generation.