Abstract
Dual-comb systems based on two optical frequency combs of slightly different line spacing emerge as powerful tools in spectroscopy and interferometry. Semiconductor lasers have a high impact in continuous-wave tunable laser spectroscopy. Here we demonstrate the first dual-comb interferometer based on a single femtosecond semiconductor laser: a dual-comb modelocked optically pumped external-cavity surface-emitting laser (MIXSEL) ideally suited for a 1 to 10 GHz comb spacing. At a center wavelength of 1.03 µm (9709 cm-1) we measured acetylene gas transmittance with a resolution of 2.7 GHz in 100 ms with residual errors of less than 3% using thousand comb lines without aliasing effects.
Highlights
An optical frequency comb (OFC) [1,2,3] consists of equidistant phase-coherent spectral lines, spaced by a frequency interval frep and shifted from the origin by an offset fCEO
We demonstrate the first dual-comb interferometer based on a single femtosecond semiconductor laser: a dualcomb modelocked optically pumped external-cavity surface-emitting laser (MIXSEL) ideally suited for a 1 to 10 GHz comb spacing
We introduce a new generation of MIXSEL chips and demonstrate real-time Dual-comb spectroscopy (DCS) of acetylene with a free running femtosecond dual-comb MIXSEL emitting at 1030 nm
Summary
An optical frequency comb (OFC) [1,2,3] consists of equidistant phase-coherent spectral lines, spaced by a frequency interval frep and shifted from the origin by an offset fCEO. With dual-comb spectrometers based on selfreferenced modelocked lasers, self-calibrated spectra with an instrumental line-shape that may be neglected are obtained in the near- [7] and mid-IR [8] for arbitrarily long integration times. Such systems rely on elaborate electronics and/or digital processing to maintain or reconstruct the coherence between the two combs. First dual-comb operation has been obtained in hybrid SDL-fiber systems [21] and with a picosecond optically pumped modelocked integrated external-cavity surface-emitting laser (MIXSEL) [22]. We introduce a new generation of MIXSEL chips and demonstrate real-time DCS of acetylene with a free running femtosecond dual-comb MIXSEL emitting at 1030 nm
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