Comparison between observation and simulation of sodium LGS return flux with a 20W CW laser on Tenerife

Holzlöhner, Ronald; Calia, Domenico Bonaccini; Bello, Dolores; Budker, Dmitry; Centrone, Mauro; Guidolin, I.; Lewis, S.; Lombardi, G.; Montilla, I.; Pedichini, Fernando; Bustos, Felipe Pedreros; Pfrommer, Thomas; Talavera, M. Reyes Garcia; Rochester, Simon

doi:10.1117/12.2233072

Cited by 9 publications

(8 citation statements)

References 3 publications

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“…LGS T in equation (2) in order to be able to estimate the correlation between both LGS and NGS downlink paths. In the right plot of Figure 7, the correlation between the NGS and LGS downlink paths…”

Section: Preliminary Resultsmentioning

confidence: 99%

“…The European Southern Observatory (ESO), together with Instituto de Astrofísica de Canarias (IAC) is currently testing in the Canary Islands the extremely large telescope LGS-AO configurations using the 20W CW, 589nm laser unit of the ESO-Wendelstein Laser Guide Star Unit (WLGSU) 2,3,16 . Until July 2016, the WLGSU was located at the Observatorio de El Teide (Izaña, Tenerife Island), a few hundred meters apart from the ESA OGS 1m telescope.…”

Section: Measurement Campaignmentioning

confidence: 99%

“…Laser guide star (LGS) technology enables adaptive optics for large ground-based telescopes because it can provide a sufficiently bright reference anywhere in the sky [1][2][3][4] . The turbulence in the lower part of the atmosphere (0-20 km) distorts the incoming light from a science object.…”

Section: Introductionmentioning

confidence: 99%

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Laser guide stars for optical free-space communications

et al. 2017

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The German Aerospace Center (DLR) and the European Southern Observatory (ESO) performed a measurement campaign together in April and July 2016 at Teide-Observatory (Tenerife), with the support of the European Space Agency (ESA), to investigate the use of laser guide stars (LGS) in ground to space optical communications. Atmospheric turbulence causes strong signal fluctuations in the uplink, due to scintillation and beam wander. In space communications, the use of the downlink channel as reference for pointing and for pre-distortion adaptive optics is limited by the size of the isokinetic and isoplanatic angle in relation to the required point-ahead angle. Pointing and phase errors due to the decorrelation between downward and upward beam due to the point-ahead angle may have a severe impact on the required transmit power and the stability of the communications link. LGSs provide a self-tailored reference to any optical ground-to-space link, independently of turbulence conditions and required point-ahead angle. In photon-starved links, typically in deep-space scenarios, LGSs allow dedicating all downlink received signal to communications purposes, increasing the available link margin. The scope of the joint DLR-ESO measurement campaign was, first, to measure the absolute value of the beam wander (uplink-tilt) using a LGS, taking a natural star as a reference, and, second, to characterize the decrease of correlation between uplink-tilt and downlink-tilt with respect to the angular separation between both sources. This paper describes the experiments performed during the measurement campaigns, providing an overview of the measured data and the first outcomes of the data post-processing.

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Section: Preliminary Resultsmentioning

confidence: 99%

Section: Measurement Campaignmentioning

confidence: 99%

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Laser guide stars for optical free-space communications

et al. 2017

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“…Last but not least, we introduced the sodium return variation due to pointing (therefore using the elevation and azimuth as described above), as described by Holzlöhner. 15 Sky Background: Because the ULTIMATE-Subaru science is primarily in the NIR, the observation will most likely be primarily in bright time. Thus, instead of using the moon phase of the date-of-year, we draw a random moon phase comprised between 50% and 100% bright time.…”

Section: Sodium Column Densitymentioning

confidence: 99%

A conceptual design study for Subaru ULTIMATE GLAO

Rigaut

Minowa

Akiyama

et al. 2018

Adaptive Optics Systems VI

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We report on the conceptual design study done for the Ground Layer Adaptive Optics system of the ULTIMATE-Subaru project. This is an ambitious instrument project, providing GLAO correction in a square field of view of 14 arcmin on a side, aiming to deliver improved seeing at the near infrared wavelength. Its client instruments are an imager and multi-IFU spectrograph at Cassegrain and a Multi-Object spectrograph at Nasmyth. In this paper, we introduce the ULTIMATE-Subaru project overview and its science case and report the results of the GLAO performance prediction based on the numerical simulation and conceptual design of the wavefront sensor system.

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“…The use of a 589nm laser for LGS at the Canary Islands is ongoing since January 2015, when the ESO Wendelstain Laser Guide Star Unit has been installed in Tenerife at the Observatorio del Teide to carry on return flux experiments ( [3], [4], [5], [6], [7]). Since July 2016, the WLGSU has been installed at the Observatorio del Roque de Los Muchachos (ORM) in La Palma, next to the William Herschel Telescope (WHT), to perform different field experiments and studies related to the LGS technologies for Adaptive Optics ( [8]).…”

Section: Introductionmentioning

confidence: 99%

Photometry and Spectrum measurements of the Laser Guide Star beam emission at Observatorio del Roque de Los Muchachos with the Gran Telescopio CANARIAS

Lombardi¹,

Calia²,

Centrone³

et al. 2017

Proceedings of the Adaptive Optics for Extremely Large Telescopes 5

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In the past years ESO has built together with industry a transportable Laser Guide Star Unit (WLGSU) to test the laser technology while supporting some strategic experiments for the LGS-AO technologies. Since July 2016, the WLGSU has been installed at the Observatorio del Roque de Los Muchachos (ORM) in La Palma, next to the William Herschel Telescope (WHT), to perform different field experiments and studies related to the LGS technologies for Adaptive Optics. To study the photometric and spectral contamination from the scattering near the laser beam along the uplink at different heights, including the LGS itself, four observing runs, each of four hours, have been granted under Program GTC3-16ITP using the OSIRIS spectro-imager at the 10.4m Gran Telescopio CANARIAS (GTC). We report preliminary results of the first two runs on the photometric and spectroscopic measurements and on the observed Raman emission of atmospheric molecules along the uplink beam.

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Comparison between observation and simulation of sodium LGS return flux with a 20W CW laser on Tenerife

Cited by 9 publications

References 3 publications

Laser guide stars for optical free-space communications

Laser guide stars for optical free-space communications

A conceptual design study for Subaru ULTIMATE GLAO

Photometry and Spectrum measurements of the Laser Guide Star beam emission at Observatorio del Roque de Los Muchachos with the Gran Telescopio CANARIAS

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