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In a dual-comb spectrometer, two asynchronous laser frequency combs with different pulse repetition rates and stabilized carrier-envelope-offset (CEO) frequencies (fCEO) are required [1]. For trace-gas detection, it is essential to extend coverage to the 2.5 – 20 µm mid-infrared (mid-IR) region. Recently we introduced a method for generating two separate mid-IR pulse sequences with slightly different repetition rates from a single SPOPO [2]. Here, we report the detection and stabilization of the CEO frequencies of the two asynchronous channels simultaneously.
© 2013 IEEE
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