Nanophotonic supercontinuum-based mid-infrared dual-comb spectroscopy
Abstract
High resolution and fast detection of molecular vibrational absorption is important for organic synthesis, pharmaceutical processes, and environmental monitoring, and is enabled by mid-infrared (mid-IR) laser frequency combs via dual-comb spectroscopy. Here, we demonstrate a novel and highly simplified approach to broadband mid-IR dual-comb spectroscopy via supercontinuum generation, achieved using unprecedented nanophotonic dispersion engineering that allows for ultra-broadband and flat-envelope mid-IR frequency combs. Our mid-IR dual-comb spectrometer has an instantaneous bandwidth covering the functional group region from 2800 - 3600 c m − 1 , comprising more than 100,000 comb lines, enabling parallel gas-phase detection with a high sensitivity, sub-Doppler spectral resolution, and a high speed. In addition to the traditional functional groups, their isotopologues are also resolved in this supercontinuum-based dual-comb spectroscopy. Our approach combines well established fiber laser combs, digital coherent data averaging, and integrated nonlinear photonics, each in itself a state-of-the-art technology, signaling the emergence of mid-IR dual-comb spectroscopy for use outside of the protected laboratory environment.
- Publication:
-
Optica
- Pub Date:
- September 2020
- DOI:
- 10.1364/OPTICA.396542
- arXiv:
- arXiv:1908.00871
- Bibcode:
- 2020Optic...7.1181G
- Keywords:
-
- Physics - Optics;
- Nonlinear Sciences - Pattern Formation and Solitons;
- Physics - Applied Physics
- E-Print:
- Optica Vol. 7, Issue 9, pp. 1181-1188 (2020)