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 

机构地区：[1]MQ Photonics,School of Mathematics and Physical Sciences,Macquarie University,2109,Australia [2]School of Engineering,Macquarie University,2109,Australia

出　　处：《Light(Advanced Manufacturing)》2024年第1期50-59,共10页光（先进制造）（英文）

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

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 regimes.We 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 waveguides.The 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.

关 键 词：Ultrafast laser inscription Thermal inscription Cumulative heating Athermal inscription Multi-scan MULTI-PASS Half-scan Bend loss High index contrast Photonic integrated circuit 

分 类 号：TN491[电子电信—微电子学与固体电子学]