Planar optics three-telescope beam combiners for astronomical interferometry

Haguenauer, Pierre; Severi, Marco; Schanen-Duport, Isabelle; Perraut-Rousselet, Karine; Berger, J.‐P.; Duchene, Yann; Lacolle, Matthieu; Kern, P.; Malbet, Fabien; Bénech, Pierre

doi:10.1117/12.390193

Cited by 8 publications

(6 citation statements)

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“…A prototype twotelescope beam combiner implemented on a 5 mm × 40 mm glass substrate has been tested in the laboratory; a transmission of 43% (dominated by a 50% loss in the Y coupler, which keeps only one interferometric output) and fringe contrast of 92% were obtained with a bandpass similar to the astronomical H band in a single polarization (Berger et al 1999, Haguenauer et al 2000a. Similar results have recently been achieved for three-telescope beam combiners (Haguenauer et al 2000b), and designs for combining the light from up to eight telescopes on one chip are already under consideration (Berger et al 2000a). First fringes on stars with the IONIC integrated optics beam combiner were obtained at the Infrared Optical Telescope Array (IOTA) in November 2000 (J.P. Berger, P. Haguenauer, P. Kern, F. Malbet, R. Millan-Gabet, K. Perraut, personal communication).…”

Section: Integrated Opticssupporting

confidence: 63%

Optical Interferometry

2017

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The field of optical and infrared (IR) interferometry has seen rapid technical and scientific progress over the past few years. A number of instruments capable of precise visibility measurements have been built, and closure-phase imaging with multitelescope arrays has been demonstrated. Astronomical results from these instruments include measurements of stellar diameters and their wavelength dependence, limb darkening, stellar surface structure, and distances of Cepheids and of Nova Cygni 1992. Precise stellar masses have been obtained from interferometric observations of spectroscopic binaries, and circumstellar disks and shells have been resolved. Searches for substellar companions and extrasolar planets with interferometric astrometry will begin soon. Nulling interferometry will enable studies of exozodiacal disks from the ground and the detection and characterization of terrestrial extrasolar planets from space. These developments are reviewed, as well as progress in some key technological areas.

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Section: Integrated Opticssupporting

confidence: 63%

Optical Interferometry

2017

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“…In this paper we describe an experiment to measure the mutual coherence function of an incoherent field using a pair of gold nano-wire dipole antennas connected by a coplanar strip transmission line to a bolometer centrally located between the two antennas [7,8]. The bolometer output is sensitive to the modulus squared of the sum of the two fields arriving from the transmission lines.…”

Section: Introductionmentioning

confidence: 99%

“…However, using light detection devices sensitive to the intensity associated with the incident field eliminates the required phase information from the measurements, and the signal-to-noise ratio considerations for heterodyne detection of incoherent radiation are very unfavorable [6]. As a result, using the Van Cittert-Zernike theorem to image at optical frequencies presently requires complicated and expensive beam splitting and combining hardware to display the required cross-correlations as fringe patterns on intensity-sensing detectors [7].…”

Section: Introductionmentioning

confidence: 99%

Measurement of the Mutual Coherence Function of an Incoherent Infrared Field with a Gold Nano-wire Dipole Antenna Array

Middlebrook

Roggemann

Boreman

et al. 2007

Int J Infrared Milli Waves

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The first direct measurement of the mutual coherence function of a spatially incoherent infrared beam was performed at 10.6 μm using a pair of infrared dipole nanowire antennas that were connected to a common bolometer in the center of the pair by short lengths of coplanar strip transmission line. A spatially incoherent source was constructed by Int J Infrared Milli Waves (dithering a BaF2 diffuser near the focus of a CO2 laser beam. The distance from the diffuser to the nano-wire antenna pair was held constant while the distance from the focus of the laser beam to the diffuser was varied to control the effective diameter of the source. The measured bolometer signal was proportional to the magnitude of the mutual coherence function at the plane of the antennas. The experimental results were found to match the predicted performance closely. If this technology can be extended to large arrays, a form of synthetic aperture optical imaging based on the Van Cittert-Zernike theorem is possible, similar to that performed at microwave frequencies now by astronomers. This has the potential to greatly increase the angular resolution attainable with optical instruments.

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“…In the design of the beam combiner it was ensured that all the interfering optical paths have the same length in order to achieve correct broadband operation. Figure 1 shows the design of the all-in-one coaxial three beam combiner following the layout given by [20]. T i are the telescope inputs, I the interferometric output and P i the photometric outputs.…”

Section: Design Considerationsmentioning

confidence: 99%

Hybrid sol-gel planar optics for astronomy

Ghasempour¹,

Leite²,

Reynaud³

et al. 2009

Opt. Express

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Hybrid sol-gel planar optics devices for astronomy are produced for the first time. This material system can operate from the visible (0.5 microm) up to the edge of astronomical J-band (1.4 microm). The design, fabrication and characterization results of a coaxial three beam combiner are given as an example. Fringe contrasts above 94% are obtained with a source with spectral bandwidth of 50 nm. These results demonstrate that hybrid sol-gel technology can produce devices with high quality, opening the possibility of rapid prototyping of new designs and concepts for astronomical applications.

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Planar optics three-telescope beam combiners for astronomical interferometry

Cited by 8 publications

References 0 publications

Optical Interferometry

Optical Interferometry

Measurement of the Mutual Coherence Function of an Incoherent Infrared Field with a Gold Nano-wire Dipole Antenna Array

Hybrid sol-gel planar optics for astronomy

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