3D-integrated beam combiner for optical spectro-interferometry

TL;DR

This paper introduces a compact 3D integrated optical beam combiner capable of measuring spectrally resolved complex visibilities for multiple channels, demonstrating its potential for spectro-interferometry imaging.

Contribution

The paper presents a novel 3D integrated optical component for spectro-interferometry, enabling accurate measurement of complex visibilities and stable closure phases.

Findings

Accurate complex visibilities retrieved over 50 nm bandwidth

Closure phase stability of λ/60 achieved

Prototype tested in R band with resolution R=130

Abstract

We present a compact setup based on a three-dimensional integrated optical component, allowing the mea- surement of spectrally resolved complex-visibilities for three channels of polychromatic light. We have tested a prototype of the component in R band and showed that accurate complex visibilities could be retrieved over a bandwidth of 50 nm centered at 650 nm (resolution: R=130). Closure phase stability in the order of $\lambda$/60 was achieved implying that the device could be used for spectro-interferometry imaging.