Towards phase-stabilized Fourier domain mode-locked frequency combs

Abstract Fourier domain mode-locked (FDML) lasers are some of the fastest wavelength-swept light sources, and used in many applications like optical coherence tomography (OCT), OCT endoscopy, Raman microscopy, detection ranging, two-photon microscopy. For a deeper understanding underlying laser physics, it is crucial to investigate field evolution FDML clarify whether provides frequency comb structure. In this case, would output coherent sweep with stable phase relation between colours. To get access field, beat signal measurement stable, monochromatic performed. Here we show experimental evidence well-defined comb-like structure laser. This agreement numerical simulations. insight will enable new jitter-free spectral-scanning, coherent, synthetic THz-generation as metrological time-frequency ruler.