High-purity microwave signal from a dual-frequency semiconductor laser for CPT atomic clocks (poster)

Paul Dumont 1 Fabiola Camargo 1 Patrick Georges 1 Gaëlle Lucas-Leclin 1 Jean-Marie Danet 2 David Holleville 2 Stéphane Guérandel 2 Grégoire Pillet 3 Ghaya Baili 3 Loic Morvan 3 Daniel Dolfi 3 Iryna Gozhyk 1, 4 G. Beaudoin 4 Isabelle Sagnes 4
1 Laboratoire Charles Fabry / Lasers
LCF - Laboratoire Charles Fabry
2 SYRTE - Systèmes de Référence Temps Espace
3 Thales Research and Technology [Palaiseau]
4 LPN - Laboratoire de photonique et de nanostructures
Abstract : Coherent population trapping (CPT) of metal-alkali atoms is an interesting technique for the development of compact atomic frequency references; it relies on the excitation of the atoms by two phase-coherent laser fields. We describe the design and operation of an innovating dual-frequency laser source dedicated to Cs CPT atomic clocks, based on the direct dual-frequency and dual-polarization operation of an optically-pumped semiconductor laser at 852 nm. The phase noise of beatnote generated by the laser source is at maximum of -90 dBrad²/Hz with active stabilization, and the relative intensity noise (RIN) has been measured at -115 dB/Hz. It would potentially results in a clock frequency stability of 1.6 .10^-12 at 1 second, limited by the laser RIN. With proper adjustments in the laser and clock set-up, we target a stability of 3.10^-13 at 1 second.
Keywords : Dual-frequency lasers Phase noise. Phase noise Atomic clocks Coherent population trapping Vertical external cavity surface emitting lasers
Type de document :
Communication dans un congrès
European Frequency & Time Forum, Jun 2014, Neuchâtel, Switzerland
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Contributeur : Gaëlle Lucas-Leclin <>
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Paul Dumont, Fabiola Camargo, Patrick Georges, Gaëlle Lucas-Leclin, Jean-Marie Danet, et al.. High-purity microwave signal from a dual-frequency semiconductor laser for CPT atomic clocks (poster). European Frequency & Time Forum, Jun 2014, Neuchâtel, Switzerland. 〈hal-01074037〉

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