(A) Illustration of the 10-GHz laser cavity. A coin is shown for size comparison. The nonlinear fiber and diffraction grating dispersing the white light are also illustrated. (B) Real-color image of the spectrally dispersed visible part of the continuum and a magnified view of the individually resolved frequency comb modes at wavelengths of 490 nm, 540 nm, 583 nm, and 632 nm. Science (fuckyeahphysics:freshphotons)