We report on a conceptually new type of waveguide in glass by femtosecond laser direct writing,namely,photonic latticelike waveguide(PLLW).The PLLWfs core consists of well-distributed and densified tracks with a sub-m...We report on a conceptually new type of waveguide in glass by femtosecond laser direct writing,namely,photonic latticelike waveguide(PLLW).The PLLWfs core consists of well-distributed and densified tracks with a sub-micron size of 0.62μm in width.Specifically,a PLLW inscribed as hexagonal-shape input with a ring-shape output side was implemented to converse Gaussian mode to doughnut-like mode,and high conversion efficiency was obtained with a low insertion loss of 1.65 dB at 976 nm.This work provides a new freedom for design and fabrication of the refractive index profile of waveguides with sub-micron resolution and broadens the functionalities and application scenarios of femtosecond laser direct-writing waveguides in future 3D integrated photonic systems.展开更多
文摘针对3 kW 半导体激光器应用于机器人表面改性系统，聚焦光斑不均匀问题，提出了一种采用菲涅耳透镜对面阵高功率半导体激光器输出光斑进行聚焦匀化的方法，设计出尺寸为10 mm×2 mm 的均匀矩形光斑。利用Zemax 和Matlab 软件进行仿真分析，研究了菲涅耳透镜楞距和入射光发散角对聚焦系统焦斑均匀性的影响。结果表明，当菲涅耳透镜楞距在1 mm 以内时，焦斑均匀性最佳约为94.90%。随着楞距的继续增大，输出光斑均匀性会逐渐降低。当楞距增大到2.5 mm 后，光斑的均匀性不再随楞距的增大而变化，基本稳定在93.85%左右。焦斑的均匀性会随着发散角的增大有所提高，但是发散角太大会使聚焦难度增加，而且光斑均匀性也随之劣化。当菲涅耳透镜楞距为1 mm，入射光发散角在12.5~20 mrad范围内时，焦斑均匀性最好约为95.22%。
基金This work was supported by the National Key R&D Program of China(No.2021YFB2800500)National Natural Science Foundation of China(Nos.U20A20211,51902286,61775192,61905215,51772270,62105297,and 61905093)+1 种基金Zhejiang Provincial Natural Science Foundation(No.LQ22F050022)State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,and Fundamental Research Funds for the Central Universities.
文摘We report on a conceptually new type of waveguide in glass by femtosecond laser direct writing,namely,photonic latticelike waveguide(PLLW).The PLLWfs core consists of well-distributed and densified tracks with a sub-micron size of 0.62μm in width.Specifically,a PLLW inscribed as hexagonal-shape input with a ring-shape output side was implemented to converse Gaussian mode to doughnut-like mode,and high conversion efficiency was obtained with a low insertion loss of 1.65 dB at 976 nm.This work provides a new freedom for design and fabrication of the refractive index profile of waveguides with sub-micron resolution and broadens the functionalities and application scenarios of femtosecond laser direct-writing waveguides in future 3D integrated photonic systems.
