Portal de Periódicos da CAPES

Time-resolved dual-comb spectroscopy with a single electro-optic modulator

2021; Optica Publishing Group; Volume: 46; Issue: 16 Linguagem: Inglês

10.1364/ol.431451

1539-4794

Jeong Hyun Huh, Zaijun Chen, Edoardo Vicentini, Theodor W. Hänsch, N. Picqué,

Spectroscopy and Laser Applications

Time-resolved near-infrared absorption spectroscopy of single non-repeatable transient events is performed at high spectral resolution with a dual-comb interferometer using a continuous-wave laser followed by a single electro-optic amplitude modulator. By sharing high-speed electrical/optical components, our spectrometer greatly simplifies the implementation of dual-comb spectroscopy and it offers a high mutual coherence time, measured up to 50-s, without any active stabilization system and/or data processing. The time resolution, which can be reconfigured a posteriori, is as short 100 microseconds in our experimental demonstration. For a span of 36 GHz, the mean signal-to-noise ratio of 80, at 100-MHz spectral resolution and 100-microsecond measurement time, enables the precise determination of the parameters of rovibrational lines, including intensity or concentration.