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Proceedings Paper

Series production of next-generation guide-star lasers at TOPTICA and MPBC
Author(s): Martin Enderlein; Axel Friedenauer; Robin Schwerdt; Paul Rehme; Daoping Wei; Vladimir Karpov; Bernhard Ernstberger; Patrick Leisching; Wallace R. L. Clements; Wilhelm G. Kaenders
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Paper Abstract

Large telescopes equipped with adaptive optics require high power 589-nm continuous-wave sources with emission linewidths of ~5 MHz. These guide-star lasers should be highly reliable and simple to operate and maintain for many years at the top of a mountain facility. After delivery of the first 20-W systems to our lead customer ESO, TOPTICA and MPBC have begun series production of next-generation sodium guide-star lasers. The chosen approach is based on ESO’s patented narrow-band Raman fiber amplifier (RFA) technology [1]. A master oscillator signal from a TOPTICA 50-mW, 1178-nm diode laser, with stabilized emission frequency and linewidth of ~ 1 MHz, is amplified in an MPBC polarization-maintaining (PM) RFA pumped by a high-power 1120-nm PM fiber laser. With efficient stimulated Brillouin scattering suppression, an unprecedented 40 W of narrow-band RFA output has been obtained. This is spatially mode-matched into a patented resonant-cavity frequency doubler providing also the repumper light [2]. With a diffraction-limited output beam and doubling efficiencies < 80%, all ESO design goals have been easily fulfilled. Together with a wall-plug efficiency of < 3%, including all system controls, and a cooling liquid flow of only 5 l/min, the modular, turn-key, maintenance-free and compact system design allows a direct integration with a launch telescope. With these fiber-based guide star lasers, TOPTICA for the first time offers a fully engineered, off-the-shelf guide star laser system for ground-based optical telescopes. Here we present a comparison of test results of the first batch of laser systems, demonstrating the reproducibility of excellent optical characteristics.

Paper Details

Date Published: 21 July 2014
PDF: 11 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 914807 (21 July 2014); doi: 10.1117/12.2055059
Show Author Affiliations
Martin Enderlein, TOPTICA Photonics AG (Germany)
Axel Friedenauer, TOPTICA Photonics AG (Germany)
Robin Schwerdt, TOPTICA Photonics AG (Germany)
Paul Rehme, TOPTICA Photonics AG (Germany)
Daoping Wei, MPB Communications Inc. (Canada)
Vladimir Karpov, MPB Communications Inc. (Canada)
Bernhard Ernstberger, TOPTICA Photonics AG (Germany)
Patrick Leisching, TOPTICA Photonics AG (Germany)
Wallace R. L. Clements, MPB Communications Inc. (Canada)
Wilhelm G. Kaenders, TOPTICA Photonics AG (Germany)


Published in SPIE Proceedings Vol. 9148:
Adaptive Optics Systems IV
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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