Dual-comb Fiber Laser-based Practical Mid-infrared Dual-comb Spectroscopy via Real-time and Long-term Coherent Averaging

Abstract

We demonstrate practical mid-infrared dual-comb spectroscopy based on a bidirectional dual-comb fiber laser. By implementing real-time and long-term coherent averaging, greenhouse gas spectroscopy with absolute wavelength around 3.9 μm is achieved without complex tight-locking system.