A high coherence, high stability laser for the photonic local oscillator distribution of the atacama large millimeter array

被引:23
作者
Cliche, JF [1 ]
Shillue, B [1 ]
Latrasse, C [1 ]
Têtu, M [1 ]
D'Addario, L [1 ]
机构
[1] DiCOS Technol Inc, Quebec City, PQ G1P 4R7, Canada
来源
GROUND-BASED TELESCOPES, PTS 1 AND 2 | 2004年 / 5489卷
关键词
ALMA; laser; coherence; linewidth; stabilization; interferometer; fiber; LO distribution;
D O I
10.1117/12.580246
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 T = 1 s, a linewidth of 2 kHz over 1 ms, a coherence of 40% at 50 kin 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.
引用
收藏
页码:1115 / 1126
页数:12
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