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  • CLEO/Europe and EQEC 2011 Conference Digest
  • OSA Technical Digest (CD) (Optica Publishing Group, 2011),
  • paper JSIII_P3

Integrated optics beam combiner at 2.2µm for astronomical interferometers

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Abstract

Integrated optics (IO) is a powerful alternative to classical bulk optics solutions in the context of interferometric combination for astronomy. Very recent results in the near infrared (1.5 to 1.8µm) [1] confirm that integrating a complex single-mode circuit on a small chip presents numerous advantages such as: compact size, stability and self-alignment. It has been demonstrated that a smart interferometric design presenting these assets is a key to reach accurate interferometric measurements [2]. As a consequence, IO technologies are of great interest for Gravity [3, 4], a second generation interferometric instrument that will combine four telescopes at the VLTI in the spectral band 2µm to 2.4µm. The instrument is developed to study general relativity effects around our galactic centre black hole. Its concept is based on two equivalent beam combiner instruments, one for scientific target, the other for freezing the atmospheric effects on the fringe patterns.

© 2011 IEEE

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