A laser setup for rubidium cooling dedicated to space applications
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We present the complete characterization of a laser setup for rubidium cooling dedicated to space applications. The experimental setup is realized with commercial off-the-shelf fiber components suitable for space applications. By frequency doubling two fiber laser diodes at 1560 nm, we produce the two optical frequencies at 780 nm required for atomic cooling of 87Rb. The first laser is locked on saturated absorption signal and long-term frequency drift has been canceled using a digital integrator. The optical frequency of the second laser is controlled relatively to the first one by a frequency comparison method. A full characterization of the setup, including frequency stability evaluation and frequency noise measurement, has been performed. The optical frequency doubling module has been submitted to environmental tests to verify its compatibility with space applications.
We would like to thank AdvEOTec company for environmental characterization of the frequency doubling module. We also thank F.X. Esnault and A. Gauguet for fruitful discussions and careful readings. We thank M. Lours from SYRTE laboratory for providing electronic locking modules.
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