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Dual electro-optic optical frequency combs for multiheterodyne molecular dispersion spectroscopy

2015; Optica Publishing Group; Volume: 23; Issue: 16 Linguagem: Inglês

10.1364/oe.23.021149

1094-4087

Pedro Martín‐Mateos, Borja Jerez, Pablo Acedo,

Advanced Frequency and Time Standards

In this paper, a multiheterodyne architecture for molecular dispersion spectroscopy based on a coherent dual-comb source generated using a single continuous wave laser and electro-optic modulators is presented and validated. The phase-sensitive scheme greatly simplifies previous dual-comb implementations by the use of an electro-optic dual comb and by phase-locking all the signal generators of the setup eliminating, in this way, the necessity of any reference optical path currently mandatory in absorption-based instruments. The architecture is immune to the classical baseline and normalization problems of absorption-based analyzers and provides an output linearly dependent on the gas concentration. In addition, the simultaneous parallel multi-wavelength measurement approach has the ability to deliver an improved output bandwidth (measurement speed) over gas analyzers based on tunable lasers.