5 January 2018 Low frequency noise fiber delay stabilized laser with reduced sensitivity to acceleration
Author Affiliations +
Proceedings Volume 10564, International Conference on Space Optics — ICSO 2012; 105643N (2018) https://doi.org/10.1117/12.2309248
Event: International Conference on Space Optics 2012, 2012, Ajaccio, Corsica, France
Abstract
Lasers with sub-hertz line-width and fractional frequency instability around 1×10-15 for 0.1 s to 10 s averaging time are currently realized by locking onto an ultra-stable Fabry-Perot cavity using the Pound-Drever-Hall method. This powerful method requires tight alignment of free space optical components, precise polarization adjustment and spatial mode matching. To circumvent these issues, we use an all-fiber Michelson interferometer with a long fiber spool as a frequency reference and a heterodyne detection technique with a fibered acousto optical modulator (AOM)1. At low Fourier frequencies, the frequency noise of our system is mainly limited by mechanical vibrations, an issue that has already been explored in the field of optoelectronic oscillators.2,3,4

Lasers with sub-hertz line-width and fractional frequency instability around 1×10-15 for 0.1 s to 10 s averaging time are currently realized by locking onto an ultra-stable Fabry-Perot cavity using the Pound-Drever-Hall method. This powerful method requires tight alignment of free space optical components, precise polarization adjustment and spatial mode matching. To circumvent these issues, we use an all-fiber Michelson interferometer with a long fiber spool as a frequency reference and a heterodyne detection technique with a fibered acousto optical modulator (AOM)1. At low Fourier frequencies, the frequency noise of our system is mainly limited by mechanical vibrations, an issue that has already been explored in the field of optoelectronic oscillators.2,3,4

After extensive study of the spools with Finite Element Modeling (FEM), we realize and test a novel spool design (Fig. 1) which is optimized for low vibration sensitivity along all spatial directions and insensitive to the way it is held. We measure a sensitivity of about 10-11/ms-2 in all direction for the complete oscillator of 2 km fiber length, limited by the out of spool elements (AOM, coupler, Faraday mirrors). The composed interferometers spool of two symmetrically mounted shows a sensitivity of about 5-8×10-12/ms-2. At the conference we will also show frequency noise measurements and the prototype of a simplified oscillator aiming to realize a robust and cost effective very low noise agile laser with acceleration sensitivity below 3×10-11/ms-2 in all spatial directions.

Fig. 1:

Low vibration sensitivity spool set up

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References

1 

H. Jiang et al, “An agile laser with ultra-low frequency noise and high sweep linearity”, Opt. Exp., vol.18, pp.3284–3297, 2010.Google Scholar

2 

S.Huang, M.Tu, S.Yao, and L.Maleki. “A turn-key optoelectronic oscillator with low acceleration sensitivity”. Proc. of the IEEE IFCS, pp. 269–279, 2000.Google Scholar

3 

J.Taylor et al., “Vibration-induced pm noise measurements of a rigid optical fiber spool”, Proc. of the IEEE IFCS, pp. 808–810, 2008.Google Scholar

4 

C.W. Nelson, A. Hati, D.A. Howe, “Common-Arm Counterpropagating Interferometer for Measurement of Vibration-Induced Noise in Fibers,” Photonics Technology Letters, IEEE, vol.23, no.21, pp.1633–1635, 2011Google Scholar

© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
B. Argence, B. Argence, C. Clivati, C. Clivati, J.-L. Dournaux, J.-L. Dournaux, D. Holleville, D. Holleville, B. Faure, B. Faure, P. Lemonde, P. Lemonde, G. Santarelli, G. Santarelli, } "Low frequency noise fiber delay stabilized laser with reduced sensitivity to acceleration", Proc. SPIE 10564, International Conference on Space Optics — ICSO 2012, 105643N (5 January 2018); doi: 10.1117/12.2309248; https://doi.org/10.1117/12.2309248
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