Hybrid sol-gel planar optics for astronomy

Ghasempour, Askari; Leite, A.M.P.; Reynaud, François; Marques, P. V. S.; Garcia, Paulo J. V.; Alexandre, Daniel; Moreira, Paulo F.

doi:10.1364/oe.17.001970

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…and 14 with V = 92.1) are shown. Interferograms obtained from the 3T combiner can be found in [21]. The comparison of the V values from 4T and 3T combiners with the value from the 2T combiner shows some degradation.…”

Section: Resultsmentioning

confidence: 99%

Performance of astronomical beam combiner prototypes fabricated by hybrid sol-gel technology

et al. 2010

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Integrated optics coaxial two, three and four telescope beam combiners have been fabricated by hybrid sol-gel technology for astronomical applications. Temporal and spectral analyses of the output interferometric signal have been performed, and their results are in mutual good agreement. The results of the characterization method employed are cross-checked using contrast measurements obtained independently, demonstrating that the chromatic differential dispersion is the main contributer to contrast reduction. The mean visibility of the fabricated devices is always higher than 95 %, obtained using a source with spectral bandwidth of 50 nm. These results show the capability of hybrid sol-gel technology for fast prototyping of complex chip designs used in astronomical applications.

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Section: Resultsmentioning

confidence: 99%

Performance of astronomical beam combiner prototypes fabricated by hybrid sol-gel technology

et al. 2010

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“…On one hand, devices fabricated by lithography have been utilised to simultaneously combine several apertures in long baseline interferometry (Gravity Collaboration 2017). Lithography is an expensive process with long-lead fabrication times (of the order of months) but has demonstrated devices working over a broad wavelength range (Ghasempour et al 2009; Labadie & Wallner 2009). On the other hand, direct-written devices can be fabricated in a matter of minutes in a cost-effective manner and can produce three-dimensional circuit designs, all of which allows for greater flexibility in design and testing (Arriola et al 2013).…”

Section: Introductionmentioning

confidence: 99%

The GLINT South testbed for nulling interferometry with photonics: Design and on-sky results at the Anglo-Australian Telescope

Lagadec

Norris

Gross

et al. 2021

Publ. Astron. Soc. Aust.

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In 1978, Bracewell suggested the technique of nulling interferometry to directly image exoplanets which would enable characterisation of their surfaces, atmospheres, weather, and possibly determine their capacity to host life. The contrast needed to discriminate starlight reflected by a terrestrial-type planet from the glare of its host star lies at or beyond a forbidding $10^{-10}$ for an exo-Earth in the habitable zone around a Sun-like star at near-infrared wavelengths, necessitating instrumentation with extremely precise control of the light. Guided Light Interferometric Nulling Technology (GLINT) is a testbed for new photonic devices conceived to overcome the challenges posed by nulling interferometry. At its heart, GLINT employs a single-mode nulling photonic chip fabricated by direct-write technology to coherently combine starlight from an arbitrarily large telescope at 1 550 nm. It operates in combination with an actuated segmented mirror in a closed-loop control system, to produce and sustain a deep null throughout observations. The GLINT South prototype interfaces the 3.9-m Anglo-Australian Telescope and was tested on a sample of bright Mira variable stars. Successful and continuous starlight injection into the photonic chip was achieved. A statistical model of the data was constructed, enabling a data reduction algorithm to retrieve contrast ratios of about $10^{-3}$ . As a byproduct of this analysis, stellar angular diameters that were below the telescope diffraction limit ( $\sim$ 100 mas) were recovered with 1 $\sigma$ accuracy and shown to be in agreement with literature values despite working in the seeing-limited regime. GLINT South serves as a demonstration of the capability of direct-write photonic technology for achieving coherent, stable nulling of starlight, which will encourage further technological developments towards the goal of directly imaging exoplanets with future large ground based and space telescopes.

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“…Among all the sensitive film fabricating methods, sol-gel technology is a very promising and extensively investigated strategy to fabricate the support for indicators of optical and chemical sensors [20]. Sol-gel sensing film is characterized by its unique feature of the highly porous threedimensional network structure.…”

Section: Introductionmentioning

confidence: 99%

Ammonia Detection by Dye Immobilized Microstructured Optical Fiber

Peng

Yang

et al. 2011

AMR

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An optical ammonia probe was fabricated based on Microstructured Polymer Optical Fiber (MPOFs) modified by eosin doped silica gel films.The structure of this probe was based on microstructured polymer optical fibers with microholes and these microholes could be used as the substrate of sensing materials and minor reaction pools. The sensing properties of the optical fiber sensor to gaseous ammonia were investigated at room temperature. The sensing probe showed different fluorescence intensity at 576 nm to different concentrations of trace ammonia in carrier gas of nitrogen. The response range was 20-350 ppm, with short response time within 600 ms.

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Hybrid sol-gel planar optics for astronomy

Cited by 5 publications

References 22 publications

Performance of astronomical beam combiner prototypes fabricated by hybrid sol-gel technology

Performance of astronomical beam combiner prototypes fabricated by hybrid sol-gel technology

The GLINT South testbed for nulling interferometry with photonics: Design and on-sky results at the Anglo-Australian Telescope

Ammonia Detection by Dye Immobilized Microstructured Optical Fiber

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