Abstract
This paper demonstrates the use of a nonlinear upconversion process to observe an infrared source through a telescope array detecting the interferometric signal in the visible domain. We experimentally demonstrate the possibility to retrieve information on the phase of the object spectrum of an infrared source by using a three-arm upconversion interferometer. We focus our study on the acquisition of phase information of the complex visibility by means of the phase closure technique. In our experimental demonstration, a laboratory binary star with an adjustable photometric ratio is used as a test source. A real time comparison between a standard three-arm interferometer and our new concept using upconversion by sum-frequency generation demonstrates the preservation of phase information which is essential for image reconstruction.
Highlights
The biggest monolithic or segmented optical telescopes such as the Very Large Telescope [1], the Keck [2] or Subaru telescopes [3], have diameters in the range of 10 m
This paper demonstrates the use of a nonlinear upconversion process to observe an infrared source through a telescope array detecting the interferometric signal in the visible domain
This two-telescope array works as a two-arm interferometer, and its highest angular resolution is related to the longest baseline
Summary
The biggest monolithic or segmented optical telescopes such as the Very Large Telescope [1], the Keck [2] or Subaru telescopes [3], have diameters in the range of 10 m. It is possible to use the aperture synthesis technique, which was firstly demonstrated by Michelson [4] For this purpose, the optical fields collected by two telescopes TiTj, spaced by a distance called baseline, are combined together. The optical fields collected by two telescopes TiTj, spaced by a distance called baseline, are combined together This two-telescope array works as a two-arm interferometer, and its highest angular resolution is related to the longest baseline. The infrared light of the object under test, collected by each Ti telescope, is converted from infrared to visible wavelength This way, the Vth complex visibility is acquired in the visible spectral domain. This experimental test has been achieved with a in-laboratory proof of principle experiment This type of high angular resolution imaging instrument has to provide reliable contrasts and phase closure measurements. The core of this paper describes the acquisition of the phase closure using our three-arm upconversion interferometer
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