28 September 2004 A high-coherence high-stability laser for the photonic local oscillator distribution of the Atacama Large Millimeter Array
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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.
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Jean-Francois Cliche, Jean-Francois Cliche, Bill Shillue, Bill Shillue, Christine Latrasse, Christine Latrasse, Michel Têtu, Michel Têtu, Larry R. D'Addario, Larry R. D'Addario, } "A high-coherence high-stability laser for the photonic local oscillator distribution of the Atacama Large Millimeter Array", Proc. SPIE 5489, Ground-based Telescopes, (28 September 2004); doi: 10.1117/12.580246; https://doi.org/10.1117/12.580246
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