Three-dimensional femtosecond laser inscription of type a-based high-efficiency first-order waveguide Bragg gratings

IF 2.3 Q2 OPTICS
R. Laberdesque, Laura Loi, T. Guérineau, Alain Abou Khalil, S. Danto, T. Cardinal, L. Canioni, Y. Petit
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引用次数: 0

Abstract

A novel type of waveguide Bragg grating (WBG) is demonstrated based on femtosecond laser-induced Type A refractive index modifications, namely based of the photochemistry of silver species in a specialty ortho-phosphate glass matrix. First-order WBGs are reported in the near-infrared and down to 736 nm in the visible. Relative transmission measurements with a 500 µm long WBGs lead to narrow-bandwidth attenuations (sub-nm spectral FWHM) from 2.29 dB to 6.25 dB for periods from 240 nm to 280 nm, respectively. The corresponding estimated backward coupling coefficients show high values from 1.66 mm-1 up to 2.69 mm-1. Additionally, we report on a true 3D helix-shaped WBG that shows an even stronger relative attenuation of 10.3 dB for a 500 µm long WBG, equivalently corresponding to a backward coupling coefficient of 3.7 mm-1. These novel results pave the way for new silver-based laser-inscribed integrated photonic devices, among which the combination of Bragg gratings to form active/passive optical resonators, but also the direct inscription of WBG at the glass interface for enhanced sensing applications.
基于a型高效一阶波导布拉格光栅的三维飞秒激光刻字
基于飞秒激光诱导的A型折射率变化,即基于特殊正磷酸盐玻璃基体中银的光化学性质,提出了一种新型波导布拉格光栅(WBG)。一阶wbg在近红外波段有报道,在可见光波段低至736nm。500µm长wbg的相对传输测量结果显示,在240 ~ 280 nm的周期内,窄带宽衰减(亚nm频谱FWHM)分别为2.29 ~ 6.25 dB。反演后向耦合系数在1.66 mm-1 ~ 2.69 mm-1范围内具有较高的数值。此外,我们报道了一个真正的3D螺旋形WBG,它显示出更强的相对衰减,对于500µm长的WBG,相对衰减为10.3 dB,相当于向后耦合系数为3.7 mm-1。这些新颖的结果为新的银基激光刻蚀集成光子器件铺平了道路,其中布拉格光栅组合形成有源/无源光学谐振器,以及在玻璃界面上直接刻蚀WBG以增强传感应用。
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来源期刊
CiteScore
4.40
自引率
0.00%
发文量
23
期刊介绍: Advanced Optical Technologies is a strictly peer-reviewed scientific journal. The major aim of Advanced Optical Technologies is to publish recent progress in the fields of optical design, optical engineering, and optical manufacturing. Advanced Optical Technologies has a main focus on applied research and addresses scientists as well as experts in industrial research and development. Advanced Optical Technologies partners with the European Optical Society (EOS). All its 4.500+ members have free online access to the journal through their EOS member account. Topics: Optical design, Lithography, Opto-mechanical engineering, Illumination and lighting technology, Precision fabrication, Image sensor devices, Optical materials (polymer based, inorganic, crystalline/amorphous), Optical instruments in life science (biology, medicine, laboratories), Optical metrology, Optics in aerospace/defense, Simulation, interdisciplinary, Optics for astronomy, Standards, Consumer optics, Optical coatings.
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