
Proceedings Paper
Polarization control optimization of the Gemini South beam transfer opticsFormat | Member Price | Non-Member Price |
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Paper Abstract
The Beam Transfer Optics (BTO) is a sub-system of the Gemini Multi-Conjugate Adaptive Optics System (GeMS). The main purpose of the BTO is to relay the laser light from the laser service enclosure up to the Laser Launch Telescope (LLT), located behind the telescope secondary mirror, where the five laser beams are propagated to the sky. Other functionalities besides relaying the laser light from the laser to the LLT, is the laser polarization control, which is crucial to any AO related system. The polarization state of the laser output beam influences the photon return flux. It is proven that the backscattering efficiency is higher when exciting the sodium layer with a circular polarized beam than one with linear polarization. For this reason circular polarization of our five laser beams that exit the LLT is desired for any telescope position. The paper reviews the current status of the Gemini South Beam Transfer Optics polarization and its control scheme. It reports on the improvements already done on the polarization control and measurement data of the polarization state at different BTO sections. In addition we discuss further optimization and upgrade ideas of the system.
Paper Details
Date Published: 7 August 2014
PDF: 9 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 91483J (7 August 2014); doi: 10.1117/12.2056295
Published in SPIE Proceedings Vol. 9148:
Adaptive Optics Systems IV
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)
PDF: 9 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 91483J (7 August 2014); doi: 10.1117/12.2056295
Show Author Affiliations
Constanza Araujo, Gemini Observatory (Chile)
Cristian Moreno, Gemini Observatory (Chile)
Vincent Fesquet, Gemini Observatory (Chile)
Cristian Moreno, Gemini Observatory (Chile)
Vincent Fesquet, Gemini Observatory (Chile)
Published in SPIE Proceedings Vol. 9148:
Adaptive Optics Systems IV
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)
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