No abstract

The phase information provided by the beat note between frequency combs and two continuous-wave lasers is used to extrapolate the phase evolution of comb modes found in a spectral region obtained via nonlinear broadening. This thereafter enables using interferogram self-correction to fully retrieve the coherence of a dual-comb beat note between two independent fiber lasers. This approach allows the f − 2 f self-referencing of both combs, which is a significant simplification. Broadband near-infrared methane spectroscopy has been conducted to demonstrate the simplified system’s preserved performance.

Coherence of dual-comb beat note between independent fiber lasers is retrieved without self-referencing, which is a simplification to existing systems. Broadband nearinfrared methane spectroscopy has been conducted to demonstrate the simplified system’s preserved performance.

We report methane spectroscopy with dual electro-optic combs using optical hybrids and pseudo-random modulation. This system helps investigate sources of systematic errors in dual-comb spectroscopy.

No abstract