Monomode fiber interferometer for single telescopes

Chang, Mark P. J. L.; Buscher, David F.

doi:10.1117/12.317171

Cited by 5 publications

(4 citation statements)

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“…When the light transmitted by each subaperture feeds an SMF before interference, the subaperture redundancy errors can be reduced significantly. SMFs spatially filter the WFEs, rejecting aberrations other than the differential piston between the subapertures but at the cost of reduced and fluctuating coupling efficiency (Coudé du Foresto et al 1997;Chang & Buscher 1998;Coudé du Foresto et al 1998;Perrin 2003;Perrin et al 2006;Tuthill et al 2010b;Bernat et al 2012;Jovanovic et al 2012). This enables the measurement of better fringe contrast and more stable closure phases.…”

Section: Effects Of Wfes On the Measurement Of Pl Visibilitiesmentioning

confidence: 99%

Coherent Imaging with Photonic Lanterns

Kim,

Fitzgerald,

Lin

et al. 2024

ApJ

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Photonic lanterns (PLs) are tapered waveguides that gradually transition from a multimode fiber geometry to a bundle of single-mode fibers (SMFs). They can efficiently couple multimode telescope light into a multimode fiber entrance at the focal plane and convert it into multiple single-mode beams. Thus, each SMF samples its unique mode (lantern principal mode) of the telescope light in the pupil, analogous to subapertures in aperture masking interferometry (AMI). Coherent imaging with PLs can be enabled by the interference of SMF outputs and applying phase modulation, which can be achieved using a photonic chip beam combiner at the backend (e.g., the ABCD beam combiner). In this study, we investigate the potential of coherent imaging by the interference of SMF outputs of a PL with a single telescope. We demonstrate that the visibilities that can be measured from a PL are mutual intensities incident on the pupil weighted by the cross correlation of a pair of lantern modes. From numerically simulated lantern principal modes of a 6-port PL, we find that interferometric observables using a PL behave similarly to separated-aperture visibilities for simple models on small angular scales (<λ/D) but with greater sensitivity to symmetries and capability to break phase angle degeneracies. Furthermore, we present simulated observations with wave front errors (WFEs) and compare them to AMI. Despite the redundancy caused by extended lantern principal modes, spatial filtering offers stability to WFEs. Our simulated observations suggest that PLs may offer significant benefits in the photon-noise-limited regime and in resolving small angular scales at the low-contrast regime.

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Section: Effects Of Wfes On the Measurement Of Pl Visibilitiesmentioning

confidence: 99%

Coherent Imaging with Photonic Lanterns

Kim,

Fitzgerald,

Lin

et al. 2024

ApJ

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“…Although a number of groups worldwide were active in experimentation with fiber optics in long baseline optical interferometry, the first published proposal for a single-telescope pupil remapping interferometer was the DAFI instrument concept [25][26][27] which appeared in the late 1990's. Several years later, a comprehensive series of papers exploring the technical and scientific aspects of the well-developed FIRST instrument concept 28,29 from Meudon Observatory injected considerable excitement with quantitative projections of performance and signal-to-noise expectations for a working device.…”

Section: Design Of a Pupil Remapping Interferometermentioning

confidence: 99%

Photonic technologies for a pupil remapping interferometer

Tuthill

Jovanović²,

Lacour³

et al. 2010

SPIE Proceedings

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Interest in pupil-remapping interferometry, in which a single telescope pupil is fragmented and recombined using fiber optic technologies, has been growing among a number of groups. As a logical extrapolation from several highly successful aperture masking programs underway worldwide, pupil remapping offers the advantage of spatial filtering (with single-mode fibers) and in principle can avoid the penalty of low throughput inherent to an aperture mask. However in practice, pupil remapping presents a number of difficult technological challenges including injection into the fibers, pathlength matching of the device, and stability and reproducibility of the results. Here we present new approaches based on recently-available photonic technologies in which coherent threedimensional waveguide structures can be sculpted into bulk substrate. These advances allow us to miniaturize the photonic processing into a single, robust, thermally stable element; ideal for demanding observatory or spacecraft environments. Ultimately, a wide range of optical functionality could be routinely fabricated into such structures, including beam combiners and dispersive or wavelength selective elements, bringing us closer to the vision of an interferometer on a chip.

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“…The net effect is that the frequency peaks in the OTF of a non redundant array are automatically of unit amplitude whatever the size of the sub-apertures. The use of fibers in non-redundant aperture masking has been proposed (Chang & Buscher 1998).…”

Section: Pupil Remapping and Spatial Filtering With Single-mode Fibersmentioning

confidence: 99%

High dynamic range imaging by pupil single-mode filtering and remapping

Perrin

Lacour

Woillez

et al. 2006

Monthly Notices of the Royal Astronomical Society

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Because of atmospheric turbulence, obtaining high angular resolution images with a high dynamic range is difficult even in the near infrared domain of wavelengths. We propose a novel technique to overcome this issue. The fundamental idea is to apply techniques developed for long baseline interferometry to the case of a single-aperture telescope. The pupil of the telescope is broken down into coherent sub-apertures each feeding a single-mode fiber. A remapping of the exit pupil allows interfering all sub-apertures non-redundantly. A diffraction-limited image with very high dynamic range is reconstructed from the fringe pattern analysis with aperture synthesis techniques, free of speckle noise. The performances of the technique are demonstrated with simulations in the visible range with an 8 meter telescope. Raw dynamic ranges of 1:$10^6$ can be obtained in only a few tens of seconds of integration time for bright objects.Comment: 5 pages, 3 figures. accepted for publication in MNRA

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Monomode fiber interferometer for single telescopes

Cited by 5 publications

References 0 publications

Coherent Imaging with Photonic Lanterns

Coherent Imaging with Photonic Lanterns

Photonic technologies for a pupil remapping interferometer

High dynamic range imaging by pupil single-mode filtering and remapping

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