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

TL;DR

This paper introduces a method for precise mid-infrared laser frequency stabilization using a remote near-infrared reference, enabling high-accuracy molecular spectroscopy and transfer of frequency stability across spectral ranges.

Contribution

It presents a novel approach for stabilizing mid-infrared lasers to a remote near-infrared reference, achieving unprecedented frequency stability and accuracy for molecular spectroscopy.

Findings

Measured OsO4 line frequency with 8x10^-13 uncertainty

Achieved mid-infrared laser stability better than 4x10^-14 at 1s

Demonstrated transfer of near-infrared stability to mid-infrared lasers

Abstract

We present a new 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 $\mu$m with a state-of-the-art uncertainty of 8x10-13. We also demonstrate the frequency stabilization of a mid-infrared laser with fractional stability better than 4x10-14 at 1 s averaging time and a line-width 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.