Mid-infrared laser phase-locking to a remote near-infrared frequency reference for high-precision molecular spectroscopy

Abstract : We present a method for accurate mid-infrared frequency measurements and stabilization to a near-infrared ultra-stable frequency reference, transmitted with a long-distance fibre link and continuously monitored against state-of-the-art atomic fountain clocks. As a first application, we measure the frequency of an OsO4 rovibrational molecular line around 10 μm with an uncertainty of 8 × 10−13. We also demonstrate the frequency stabilization of a mid-infrared laser with fractional stability better than 4 × 10−14 at 1 s averaging time and a linewidth below 17 Hz. This new stabilization scheme gives us the ability to transfer frequency stability in the range of 10−15 or even better, currently accessible in the near infrared or in the visible, to mid-infrared lasers in a wide frequency range.
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B Chanteau, O. Lopez, W Zhang, D Nicolodi, B Argence, et al.. Mid-infrared laser phase-locking to a remote near-infrared frequency reference for high-precision molecular spectroscopy. New Journal of Physics, Institute of Physics: Open Access Journals, 2013, 15, pp.073003. ⟨10.1088/1367-2630/15/7/073003⟩. ⟨hal-01587027⟩

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