Optical Spectroscopy with Electro-optic and Microresonator Frequency Combs

Optical frequency combs provide vast sets of laser lines, equidistantly spaced in the optical frequency domain. Spanning across broad optical bandwidths, they have revolutionized optical time and frequency metrology with profound implications for optical precision spectroscopy.
While usually derived from mode-locked lasers, frequency combs can also be generated in nonlinear micro-resonators or via electro-optic modulation. These complementary techniques permit generating combs with laser lines that can readily be resolved as well as dual combs with high mutual coherence.
Here, I will talk about our recent efforts in microresonator and electro-optic frequency combs and highlight applications in astronomy, trace gas detection and hyperspectral imaging.