Low bend loss,high index,composite morphology ultra-fast laser written waveguides for photonic integrated circuits

作     者：Andrew Ross-Adams Toney Teddy Fernandez Michael Withford Simon Gross 

作者机构：MQ PhotonicsSchool of Mathematics and Physical SciencesMacquarie University2109Australia School of EngineeringMacquarie University2109Australia 

出 版 物：《Light(Advanced Manufacturing)》 (光（先进制造）（英文）)

年 卷 期：2024年第5卷第1期

页      面：50-59页

学科分类：08[工学] 0803[工学-光学工程] 

基　　金：funded by the Australian Research Council Discovery Program under grant FT200100590 

主　　题：Ultrafast laser inscription Thermal inscription Cumulative heating Athermal inscription Multi-scan Multi-pass Half-scan Bend loss High index contrast Photonic integrated circuit 

摘      要：We demonstrate a novel,composite laser written 3D waveguide,fabricated in boro-aluminosilicate glass,with a refractive index contrast of 1.12×10^(−2).The waveguide is fabricated using a multi-pass approach which leverages the respective refractive index modification mechanisms of both the thermal and athermal inscription *** present the study and optimisation of inscription parameters for maximising positive refractive index change and ultimately demonstrate a dramatic advancement on the state of the art of bend losses in laser-written *** 1.0 dB cm−1 bend loss cut-off radius is reduced from 10 mm to 4 mm,at a propagation wavelength of 1550 nm.