| Title: |
MILENE : An optical bench to explore mid infrared integrated circuits technologies for four beam nullers |
| Authors: |
Gemmerlé, Louis; Lallement, Manon; Berger, Jean-Philippe; Martin, Guillermo; Curaba, Stéphane; Labeye, Pierre |
| Contributors: |
Institut de Planétologie et d'Astrophysique de Grenoble (IPAG); Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (Fédération OSUG)-Université Grenoble Alpes (UGA); Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI); Direction de Recherche Technologique (CEA) (DRT (CEA)); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA); ANR-22-EXOR-0005,Photonics,Integrated Optics for Optical Interferometry(2022) |
| Source: |
Science and Technology for the Era of LIFE ; https://hal.science/hal-05390426 ; Science and Technology for the Era of LIFE, Nov 2025, Barcelone, Spain |
| Publisher Information: |
CCSD |
| Publication Year: |
2025 |
| Collection: |
Université Grenoble Alpes: HAL |
| Subject Terms: |
Mid infrared; Test bench; Interferometry; Photonics; [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] |
| Subject Geographic: |
Spain |
| Time: |
Barcelone, Spain |
| Description: |
International audience ; Nulling interferometry allows us to benefit from the high angular resolution provided by current ground-based (or future spatial) interferometric facilities, as well as the capability to observe exoplanets with higher planet-to-star flux ratio through coherent cancellation of the flux from the star. Using photonic integrated circuits (PIC) for the aperture recombination function has the potential to considerably improve the instrument performance : it allows the instrument to gain in compactness and thermo-mechanical stability compared to bulk optics as well as providing intrinsic self-alignment, positively impacting the nulling performance. We are currently exploring several mid-infrared technologies among which the Si/SiGe offers a great potential for the 3-9 μm domain. For that purpose we have built a dedicated four beam interferometric bench. The chosen design of this characterisation bench is composed of an association of Michelsonʼs interferometers, dividing the flux of a unique source into fourbeams. The coaxial aspect of this architecture provides identical pupils for all the beams, so a more uniform injection efficiency among the inputs of the nulling PIC. Moreover, in order to achieve deep null values, a stringent precision in controlling the phase, intensity and polarisation of each individual beam is required. We present the error budget established to evaluate these constraints and the characterisation of various control elements used on the bench. Monochromatic interferograms (at 3.39 μm) acquired using a preliminary version of the optical bench are presented. We analyse several sources of degradation of the experimental null value and discuss ways to mitigate them. |
| Document Type: |
conference object; still image |
| Language: |
English |
| Availability: |
https://hal.science/hal-05390426; https://hal.science/hal-05390426v1/document; https://hal.science/hal-05390426v1/file/POSTER_HAL.pdf |
| Rights: |
info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.9D7F011C |
| Database: |
BASE |