Abstract
Frequency-agile dual-comb spectroscopy (DCS) with electro-optic modulators (EOMs) promises to facilitate the implementation of DCS in many environmental applications. In this Letter, we demonstrate a 1MHz resolution electro-optic dual-comb system with a measurement speed of 20kHz. We generate an electro-optic frequency comb (EOFC) consisting of 50000 teeth with 1MHz line spacing. Each comb tooth is well resolved by another EOFC with 2.5GHz line spacing. We record transmittances of high Q-factor resonators within milliseconds. Our figure of merit is shown to be 36 times more sensitive than a configuration that would beat two combs of 1MHz spacing.
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