Diffraction-limited integral-field spectroscopy for extreme adaptive optics systems with the multicore fiber-fed integral-field unit

Haffert, Sebastiaan Y.; Harris, Robert J.; Zanutta, Alessio; Pike, Fraser A.; Bianco, Andrea; Redaelli, Edoardo; Benoît, Aurélien; MacLachlan, David Guillaume; Ross, Calum A.; Gris-Sánchez, Itandehui; Trappen, Mareike; Xu, Yilin; Blaicher, Matthias; Maier, Pascal; Riva, G.; Sinquin, Baptiste; Kulcsár, Caroline; Bharmal, Nazim Ali; Gendron, É.; Staykov, L.; Morris, Tim; Barboza, Santiago; Muench, Norbert; Bardou, Lisa; Prengère, Léonard; Raynaud, Henri-François; Hottinger, Phillip; Anagnos, Theodoros; Osborn, James; Koos, Christian; Thomson, Robert R.; Birks, T. A.; Snellen, I. A. G.; Keller, Christoph U.

doi:10.1117/1.jatis.6.4.045007

Cited by 16 publications

(11 citation statements)

References 52 publications

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“…CANARY is an AO demonstrator for the Extremely Large Telescope (ELT), designed with the flexibility to try out different AO flavours and new wavefront sensor types. It has a history of hosting experimental instruments (Harris et al 2015;Haffert et al 2020;Sinquin et al 2020) and crucially is designed to record test data from them in conjunction with AO measurements.…”

Section: On-sky Validation Examplementioning

confidence: 99%

All-fibre wavefront sensor

Wright,

Yerolatsitis,

Harrington

et al. 2022

Preprint

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We report on a tapered three-core optical fibre that can be used as a tip-tilt wavefront sensor. In this device, a coupled region of a few millimetres at the sensing tip of the fibre converts fragile phase information from an incoming wavefront into robust intensity information within each of the cores. The intensity information can be easily converted to linear wavefront error over small ranges, making it ideal for closed loop systems.The sensor uses minimal information to infer tip-tilt and is compatible with remote detector arrays. We explore its application within adaptive optics and present a validation case to show its applicability to astronomy.

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Section: On-sky Validation Examplementioning

confidence: 99%

All-fibre wavefront sensor

Wright,

Yerolatsitis,

Harrington

et al. 2022

Preprint

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“…SMFs also act as a spatial filter and couple very little sky background [7]. This makes them highly suitable for direct exoplanet spectroscopy [8] and interferometry [9][10][11][12][13]. When coupled to a high resolution spectrograph, SMFs also remove conventional modal noise, allowing an increase in the achievable radial velocity (RV) precision [14].…”

Section: Introductionmentioning

confidence: 99%

On-sky results for the integrated microlens ring tip-tilt sensor

et al. 2021

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We present the first on-sky results of the micro-lens ring tip-tilt (MLR-TT) sensor. This sensor utilizes a 3D printed micro-lens ring feeding six multi-mode fibers to sense misaligned light, allowing centroid reconstruction. A tip-tilt mirror allows the beam to be corrected, increasing the amount of light coupled into a centrally positioned single-mode (science) fiber. The sensor was tested with the iLocater acquisition camera at the Large Binocular Telescope in November 2019. The limit on the maximum achieved root mean square reconstruction accuracy was found to be 0.19 λ/D in both tip and tilt, of which approximately 50% of the power originates at frequencies below 10 Hz. We show the reconstruction accuracy is highly dependent on the estimated Strehl ratio and simulations support the assumption that residual adaptive optics aberrations are the main limit to the reconstruction accuracy. We conclude that this sensor is ideally suited to remove post-adaptive optics non-common path tip tilt residuals. We discuss the next steps for the concept development, including optimizations of the lens and fiber, tuning of the correction algorithm and selection of optimal science cases.

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“…And finally, SMF can be used to design more efficient coronagraphs [13][14][15]. Several ExAO systems have such a capability installed [16,17] or planned [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…Currently multielement aspheric micron scaled optics can be created and written directly on top of fibers [23]. The technology has been used to create micro-lens arrays that feed compact multi-core fibers that are used as input to spectrographs [17,19]. However, the micro-lens designs to date, consist only of single-element spherical singlets.…”

Section: Introductionmentioning

confidence: 99%

Fundamental limit of single-mode integral-field spectroscopy

Haffert

2021

Preprint

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There are several high-performance adaptive optics systems that deliver diffractionlimited imaging on ground-based telescopes, which renewed the interest of single-mode fiber (SMF) spectroscopy for exoplanet characterization. However, the fundamental mode of a telescope is not well matched to those of conventional SMFs. With the recent progress in asphere manufacturing techniques it may be possible to reshape the fundamental mode of a SMF into any arbitrary distribution. An optimization problem is setup to investigate what the optimal mode field distribution is and what the fundamental throughput limit is for SMF spectroscopy. Both single-object spectrographs and integral-field spectrographs are investigated. The optimal mode for single-object spectrographs is found to be the aperture function of the exit pupil, while for integral-field spectrographs the optimal mode depends on the spatial sampling of the focal plane. For dense sampling, a uniform mode is optimal, while for sparse sampling, the mode of a conventional SMF is near optimal. With the optimal fiber mode, high throughput (>80 %) can be achieved when the focal plane is (super) Nyquist sampled. For the Nyquist sampled cases, the optimal mode has almost 20 % more throughput than a conventional SMF.

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Diffraction-limited integral-field spectroscopy for extreme adaptive optics systems with the multicore fiber-fed integral-field unit

Cited by 16 publications

References 52 publications

All-fibre wavefront sensor

All-fibre wavefront sensor

On-sky results for the integrated microlens ring tip-tilt sensor

Fundamental limit of single-mode integral-field spectroscopy

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