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Communication Dans Un Congrès Année : 2010

How nonlinear optics can merge interferometry for high resolution imaging

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Damien Ceus
  • Fonction : Auteur
  • PersonId : 914219
François Reynaud
Alessandro Tonello
Laurent Delage
Ludovic Grossard

Résumé

High resolution stellar interferometers are very powerful efficient instruments to get a better knowledge of our Universe through the spatial coherence analysis of the light. For this purpose, the optical fields collected by each telescope Ti are mixed together. From the interferometric pattern, two expected information called the contrast Cij and the phase information φij are extracted. These information lead to the Vij, called the complex visibility, with Vij=Cijexp(jφij). For each telescope doublet TiTj, it is possible to get a complex visibility Vij. The Zernike Van Cittert theorem gives a relationship between the intensity distribution of the object observed and the complex visibility. The combination of the acquired complex visibilities and a reconstruction algorithm allows imaging reconstruction. To avoid lots of technical difficulties related to infrared optics (components transmission, thermal noises, thermal cooling...), our team proposes to explore the possibility of using nonlinear optical techniques. This is a promising alternative detection technique for detecting infrared optical signals. This way, we experimentally demonstrate that frequency conversion does not result in additional bias on the interferometric data supplied by a stellar interferometer. In this presentation, we report on wavelength conversion of the light collected by each telescope from the infrared domain to the visible. The interferometric pattern is observed in the visible domain with our, so called, upconversion interferometer. Thereby, one can benefit from mature optical components mainly used in optical telecommunications (waveguide, coupler, multiplexer...) and efficient low-noise detection schemes up to the single-photon counting level.
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Dates et versions

hal-00642771 , version 1 (18-11-2011)

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  • HAL Id : hal-00642771 , version 1

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Damien Ceus, François Reynaud, Alessandro Tonello, Laurent Delage, Ludovic Grossard. How nonlinear optics can merge interferometry for high resolution imaging. ICSO 2010 - International Conference on Space Optics, Oct 2010, Rhodes, Greece. pp.Inconnu. ⟨hal-00642771⟩

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