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Open‐path dual‐comb spectroscopy provides multispecies atmospheric gas concentration measurements with high precision. Here, open‐path dual‐comb spectroscopy is extended to the mid‐infrared 5 µm atmospheric window, enabling atmospheric concentration retrievals of the primary greenhouse gases, N2O, CO2, and H2O, as well as the criteria air pollutants O3 and CO across 600 m and 2 km round‐trip paths...
We develop a system to convert the high frequency accuracy of optical clocks to an optical timescale that outputs a 1 pulse per second (PPS) optical time signal at a defined reference plane.
We demonstrate frequency comb based, robust, long-term conversion of optical frequency standards to an optical timescale that outputs a 1 pulse per second (PPS) optical time signal at a defined reference plane. This level of robustness is essential for time standards based on optical clocks.
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