Daoyuan Chen, Zhi Chen, Yi Yang, Yuying Wang, Xuhu Han, Kuen Yao Lau, Zhemin Wu, Chen Zou, Yu Zhang, Beibei Xu, Xiaofeng Liu, Zhijun Ma, Guoping Dong, Giuseppe Barillaro, Lijing Zhong, Jianrong Qiu
Optical waveguides fabricated in single crystals offer crucial passive/active optical components for photonic integrated circuits. Single crystals possess inherent advantages over their amorphous counterpart, such as lower optical losses in visible-to-mid-infrared band, larger peak emission cross-section, higher doping concentration. However, the writing of Type-I positive refractive index modified waveguides in single crystals using femtosecond laser technology presents significant challenges. Herein, we introduce a novel femtosecond laser direct writing technique that combines slit-shaping with an immersion oil objective to fabricate low-loss Type-I waveguides in single crystals...
May 8, 2024: Advanced Materials