An innovative integral field unit upgrade with 3D-printed micro-lenses for the RHEA at Subaru

Anagnos, Theodoros; Maier, Pascal; Hottinger, Philipp; Betters, Christopher H.; Feger, Tobias; Leon-Saval, Sergio G.; Gris-Sánchez, Itandehui; Yerolatsitis, Stephanos; Lozi, Julien; Birks, T. A.; Vievard, Sébastien; Jovanović, Nemanja; Rains, Adam D.; Ireland, Michael; Harris, Robert J.; Tiong, Blaise C. Kuo; Guyon, Olivier; Norris, Barnaby; Haffert, Sebastiaan Y.; Blaicher, Matthias; Xu, Yi; Straub, Moritz; Pott, Jörg-Uwe; Sawodny, Oliver; Neureuther, Philip L.; Coutts, David W.; Schwab, Christian; Koos, Christian; Quirrenbach, A.

doi:10.1117/12.2560626

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…The low coupling efficiency is likely due to misalignments in the commercial off-the-shelf micro-lens array (MLA) and anamorphic prisms to couple the light into the cores of the bundle of the fibers (stacked and glued together), which are sensitive to alignment, illustrating the difficulties of applying conventional approaches to SM technology. Following a similar approach as detailed below, the IFU of RHEA was upgraded recently with 3D-printed MLAs on a MCF in the visual band [57].…”

Section: Introductionmentioning

confidence: 99%

3D-M3: high-spatial-resolution spectroscopy with extreme AO and 3D-printed micro-lenslets

et al. 2021

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By combining integral field spectroscopy with extreme adaptive optics, we are now able to resolve objects close to the diffraction limit of large telescopes, exploring new science cases. We introduce an integral field unit designed to couple light with a minimal plate scale from the SCExAO facility at NIR wavelengths to a single-mode spectrograph. The integral field unit has a 3D-printed micro-lens array on top of a custom single-mode multi-core fiber, to optimize the coupling of light into the fiber cores. We demonstrate the potential of the instrument via initial results from the first on-sky runs at the 8.2 m Subaru Telescope with a spectrograph using off-the-shelf optics, allowing for rapid development with low cost.

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Section: Introductionmentioning

confidence: 99%

3D-M3: high-spatial-resolution spectroscopy with extreme AO and 3D-printed micro-lenslets

et al. 2021

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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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Fundamental limit of single-mode integral-field spectroscopy

Haffert

2021

J. Opt. Soc. Am. B

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There are several high-performance adaptive optics systems that deliver diffraction-limited imaging on ground-based telescopes, which has renewed interest in 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 set up 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; for integral-field spectrographs, the optimal mode depends on the spatial sampling of the focal plane. For dense sampling, a uniform mode is optimal; for sparse sampling, the mode of a conventional SMF is near optimal. With the optimal fiber mode, a high throughput ( > 80 % ) can be achieved when the focal plane is (super) Nyquist sampled. For Nyquist sampled cases, the optimal mode has almost 20% more throughput than a conventional SMF.

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An innovative integral field unit upgrade with 3D-printed micro-lenses for the RHEA at Subaru

Abstract: In the new era of Extremely Large Telescopes (ELTs) currently under construction, challenging requirements drive spectrograph designs towards techniques that efficiently use a facility's light collection power. Operating in

Cited by 3 publications

References 16 publications

3D-M3: high-spatial-resolution spectroscopy with extreme AO and 3D-printed micro-lenslets

3D-M3: high-spatial-resolution spectroscopy with extreme AO and 3D-printed micro-lenslets

Fundamental limit of single-mode integral-field spectroscopy

Fundamental limit of single-mode integral-field spectroscopy

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