Yb:KLuW Channel Waveguide Lasers Passively Q-Switched by Evanescent-Field Interaction with Carbon Nanotubes
2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)(2019)
摘要
Highly efficient and compact pulsed laser sources have tremendous potential for integrated photonic devices in numerous applications including spectroscopy, metrology and microscopy. Yb 3+ -doped monoclinic double-tungstate crystals exhibit broad and large absorption and emission cross-sections and extremely low quantum defects. Channel waveguide structures have been actively studied for miniaturization of laser systems and efficient fundamental-mode laser operation with low lasing thresholds. One of the powerful methods to fabricate waveguide structures in a transparent material is the femtosecond direct laser writing (fs-DLW). Recently, pulsed waveguide lasers utilizing saturable absorbers (SAs) have been demonstrated with SESAM and low-dimensional carbon nanostructures. Intrinsic characteristics such as ultrafast response, broadband nonlinear absorption and flexibility for integration make single-walled carbon nanotubes (SWCNTs) and graphene unique for various types of pulsed lasers. Placing a SA between the waveguide and the laser mirror results in additional intracavity losses and Q-switching instabilities due to thermal loads through direct-field interaction with the SA. Therefore, the damage-free coupling and the potential of a monolithic design including SAs in compact lasers are highly desired.
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关键词
SESAM,intracavity losses,Q-switching instability,thermal loads,damage-free coupling,monolithic design,passive Q-switching,saturable absorbers,transparent material,Yb3+-doped monoclinic double-tungstate crystals,Yb:KLuW channel waveguide lasers,laser systems,channel waveguide structures,quantum defects,emission cross-sections,microscopy,metrology,integrated photonic devices,compact pulsed laser sources,evanescent-field interaction,compact lasers,direct-field interaction,laser mirror,pulsed lasers,single-walled carbon nanotubes,nonlinear absorption,low-dimensional carbon nanostructures,pulsed waveguide lasers,femtosecond direct laser writing,lasing thresholds,fundamental-mode laser operation,KLu(WO4)2:Yb
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