Photonic chip for visible interferometry: laboratory characterization and comparison with the theoretical model

arXiv - PHYS - Instrumentation and Methods for Astrophysics Pub Date : 2024-09-05 DOI:arxiv-2409.03808

Manon Lallement, Sylvestre Lacour, Elsa Huby, Guillermo Martin, Kevin Barjot, Guy Perrin, Daniel Rouan, Vincent Lapeyrere, Sebastien Vievard, Olivier Guyon, Julien Lozi, Vincent Deo, Takayuki Kotani, Cecil Pham, Cedric Cassagnettes, Adrien Billat, Nick Cvetojevic, Franck Marchis

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Abstract

Integrated optics are used to achieve astronomical interferometry inside robust and compact materials, improving the instruments stability and sensitivity. In order to perform differential phase measurements at the H$\alpha$ line (656.3 nm) with the 600-800 nm spectro-interferometer FIRST, a photonic integrated circuit (PIC) is being developed. This PIC performs the visible combination of the beams coming from the telescope pupil sub-apertures. In this work, TEEM Photonics waveguides fabricated by $K_+:Na_+$ ion exchange in glass are characterized in terms of single-mode range and mode field diameter. The waveguide diffused index profile is modeled on Beamprop software. FIRST beam combiner building blocks are simulated, especially achromatic directional couplers and passive $\pi/2$ phase shifters for a potential ABCD interferometric combination.

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用于可见光干涉测量的光子芯片：实验室鉴定及与理论模型的比较

集成光学器件被用来实现天文干涉测量，它采用了坚固而紧凑的材料，提高了仪器的稳定性和灵敏度。为了利用 600-800 nm 光谱干涉仪 FIRST 在 H$\alpha$ 线（656.3 nm）上进行差分相位测量，正在开发一种光子集成电路（PIC）。在这项工作中，用 $K_+:Na_+$ 离子交换法在玻璃中制造的 TEEM Photonics 波导在单模范围和模式场直径方面进行了表征。在 Beamprop 软件上对波导的扩散指数曲线进行了建模。对 FIRST 光束组合器的构建模块进行了模拟，特别是消色差定向耦合器和无源 $\pi/2$ 移相器，以实现潜在的 ABCD 干涉测量组合。

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arXiv - PHYS - Instrumentation and Methods for Astrophysics

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