The laser guide star facility for Subaru Telescope

Hayano, Yutaka; Saito, Yoshihiko; Ito, Meguru; Saito, Norihito; Kato, Mayumi; Akagawa, Koji; Takazawa, Akira; Colley, Stephen; Dinkins, Matthew; Eldred, Michael; Golota, Taras; Guyon, Olivier; Hattori, Masayuki; Oya, Shin; Watanabe, Makoto; Takami, Hideki; Wada, Satoshi; Iye, Masanori

doi:10.1117/12.672583

Cited by 15 publications

(5 citation statements)

References 10 publications

(4 reference statements)

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“…At the Subaru Telescope, following the success of the first AO system AO36, AO188 was developed and installed in 2006, 1 including a laser guide star. 2 With 188 actuators in the pupil, AO188 can provide Strehl ratios of ∼ 20-40% in H-band in median seeing. 3 Three instruments are using the output of AO188:…”

Section: Introductionmentioning

confidence: 99%

AO3000 at Subaru: combining for the first time a NIR WFS using First Light’s C-RED ONE and ALPAO’s 64x64 DM

Lozi¹,

Ahn²,

Clergeon

et al. 2022

Adaptive Optics Systems VIII

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After 16 years of on-sky operation, Subaru Telescope's facility adaptive optics AO188 is getting several major upgrades to become the extreme-AO AO3000 (3000 actuators in the pupil compared to 188 previously). AO3000 will provide high-Strehl images for several instruments from visible to mid-infrared, notably the Infrared Camera and Spectrograph (IRCS), and the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO). For this upgrade, the original 188-element deformable mirror (DM) will be replaced with ALPAO's 64 × 64 DM. The visible wavefront sensor will also be upgraded at a later date, but in the meantime we are adding a near-infrared Wavefront Sensor (NIR WFS), using either a double roof prism pyramid mode or a focal plane WFS mode. This new wavefront sensor will use for the first time First Light's C-RED ONE camera, allowing for a full control of the 64 × 64 DM at up to 1.6 kHz. One of the challenges is the use of non-destructive reads and a rolling shutter with the modulated pyramid. This upgrade will be particularly exciting for SCExAO, since the extreme-AO loop will focus more on creating high-contrast dark zones instead of correcting large atmospheric residuals. It will be the first time two extreme-AO loops will be combined on the same telescope. Finally, the setup AO3000+SCExAO+IRCS will serve as a perfect demonstrator for the Thirty Meter Telescope's Planetary Systems Imager (TMT-PSI). We will present here the design, integration and testing of AO3000, and show the first on-sky results.

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Section: Introductionmentioning

confidence: 99%

AO3000 at Subaru: combining for the first time a NIR WFS using First Light’s C-RED ONE and ALPAO’s 64x64 DM

Lozi¹,

Ahn²,

Clergeon

et al. 2022

Adaptive Optics Systems VIII

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“…Due to higher altitude, sodium LGS offer substantially improved spatial sampling of atmospheric turbulence (Hardy 1998). Nearly all the 8+ meter telescopes are using or planning to use sodium LGS for their AOS, including the upcoming Thirty Meter Telescope (TMT) and the European Extremely Large Telescope (E-ELT) (d 'Orgeville et al 1999;Wizinowich et al 2006;Calia et al 2006;Hayano et al 2006;Joyce et al 2006;Boyer et al 2010;Diolaiti et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Photon Return On-Sky Test of Pulsed Sodium Laser Guide Star with D_2bRepumping

Jin¹,

Wei²,

Lu³

et al. 2015

Publications of the Astronomical Society of the Pacific

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Sodium laser guide star (LGS) system has become one of the critical components in modern astronomical adaptive optics system (AOS), especially for the next-generation extremely large telescopes, such as the Thirty Meter Telescope and the European Extremely Large Telescope. Since the wavefront detection performance of AOS is directly related to the brightness of LGS, it is important for AOS to maximize its photon generation efficiency by all means. Sodium D 2b line repumping is such a technique that can greatly increase the returned photons for either sodium continuous wave (CW) laser or pulsed laser. This technique has been studied theoretically and field tested with a 20 W CW laser by European Southern Observatory team. However, field test results of a 20 W class pulsed laser with D 2b repumping have not been reported yet. In this paper, our latest field test results with theoretical comparison of D 2b repumping with a 20 W quasi-continuous wave (QCW) pulsed laser will be presented. With a linearly polarized beam, approximate 40% photon return enhancement was achieved when 10% of laser power was detuned to D 2b line, which agreed well with results from a rate equation-based Monte Carlo photon return simulation program. Both experiment and simulation results indicate that with a higher laser intensity projected at the sodium layer, the D 2b repumping will be more effective.

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“…These numbers exclude non-common path errors and wavefront errors produced by the optics of HiCIAO. See Takami et al and Hayano et al (these proceedings) for more details on the LGSAO188 adaptive optics system 14,15 .…”

Section: Ao Performancementioning

confidence: 99%

Concept and science of HiCIAO: high contrast instrument for the Subaru next generation adaptive optics

et al. 2006

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Direct exploration of exoplanets is one of the most exciting topics in astronomy. Our current efforts in this field are concentrated on the Subaru 8.2m telescope at Mauna Kea, Hawaii. Making use of the good observing site and the excellent image quality, the infrared coronagraph CIAO (Coronagraphic Imager with Adaptive Optics) has been used for various kinds of surveys, which is the first dedicated cold coronagraph on the 8-10m class telescopes. However, its contrast is limited by the low-order adaptive optics and a limited suppression of the halo speckle noise.HiCIAO is a new high-contrast instrument for the Subaru telescope. HiCIAO will be used in conjunction with the new adaptive optics system (188 actuators and/or its laser guide star -AO188/LGSAO188) at the Subaru infrared Nasmyth platform. It is designed as a flexible camera comprising several modules that can be configured into different modes of operation. The main modules are the AO module with its future extreme AO capability, the warm coronagraph module, and the cold infrared camera module. HiCIAO can combine coronagraphic techniques with either polarization or spectral simultaneous differential imaging modes. The basic concept of such differential imaging is to split up the image into two or more images, and then use either different planes of polarization or different spectral filter band-passes to produce a signal that distinguishes faint objects near a bright central object from scattered halo or residual speckles.In this contribution, we will outline the HiCIAO instrument, its science, and performance simulations. The optical and mechanical details are described by Hodapp et al. (2006) 1 . We also present a roadmap of Japanese facilities and future plans, including ASTRO-F (AKARI), SPICA, and JTPF, for extrasolar planet explorations.

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The laser guide star facility for Subaru Telescope

Cited by 15 publications

References 10 publications

AO3000 at Subaru: combining for the first time a NIR WFS using First Light’s C-RED ONE and ALPAO’s 64x64 DM

AO3000 at Subaru: combining for the first time a NIR WFS using First Light’s C-RED ONE and ALPAO’s 64x64 DM

Photon Return On-Sky Test of Pulsed Sodium Laser Guide Star with D_2bRepumping

Concept and science of HiCIAO: high contrast instrument for the Subaru next generation adaptive optics

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The laser guide star facility for Subaru Telescope

Cited by 15 publications

References 10 publications

AO3000 at Subaru: combining for the first time a NIR WFS using First Light’s C-RED ONE and ALPAO’s 64x64 DM

AO3000 at Subaru: combining for the first time a NIR WFS using First Light’s C-RED ONE and ALPAO’s 64x64 DM

Photon Return On-Sky Test of Pulsed Sodium Laser Guide Star with D2bRepumping

Concept and science of HiCIAO: high contrast instrument for the Subaru next generation adaptive optics

Contact Info

Product

Resources

About

Photon Return On-Sky Test of Pulsed Sodium Laser Guide Star with D_2bRepumping