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Proceedings Paper

A high-coherence high-stability laser for the photonic local oscillator distribution of the Atacama Large Millimeter Array
Author(s): Jean-Francois Cliche; Bill Shillue; Christine Latrasse; Michel Têtu; Larry R. D'Addario
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Paper Abstract

We present the architecture and the characterization results of a Master Laser prototype that can be used to distribute a phase-coherent millimeter wave reference within the Atacama Large Millimeter Array. This source is obtained by frequency-locking a 1556-nm narrow linewidth DFB fiber laser to a two-photon transition in rubidium 85 at 778 nm after second harmonic generation in a non-linear waveguide crystal. The prototype yielded an absolute wavelength of 1556.210 843 nm, a stability of 2x10-12 at tau = 1 s, a linewidth of 2 kHz over 1 ms, a coherence of 40% at 50 km over 1 ms, and a RIN below -145 dBc/Hz for f>10 MHz. Using this laser, the transmission of an 18.6 GHz reference over 10 km of fiber was achieved with a residual phase fluctuations lower than 0.22 degrees RMS (33 fs RMS) over 10 s.

Paper Details

Date Published: 28 September 2004
PDF: 12 pages
Proc. SPIE 5489, Ground-based Telescopes, (28 September 2004); doi: 10.1117/12.580246
Show Author Affiliations
Jean-Francois Cliche, DiCOS Technologies, Inc. (Canada)
Bill Shillue, National Radio Astronomy Observatory (United States)
Christine Latrasse, DiCOS Technologies, Inc. (Canada)
Michel Têtu, DiCOS Technologies, Inc. (Canada)
Larry R. D'Addario, National Radio Astronomy Observatory (United States)

Published in SPIE Proceedings Vol. 5489:
Ground-based Telescopes
Jacobus M. Oschmann Jr., Editor(s)

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