Our group is developing chip-scale nonlinear optical devices based on dispersion engineered waveguides in a variety of materials including silicon, silicon nitride, and AlGaAs. A major thrust for these devices is to enable chip-scale frequency combs in the near-infrared and mid-infrared spectral regions. Our goal is to develop end-to-end capabilities in this area, including electromagnetic design and modeling of waveguides, cleanroom fabrication, and optical characterization of completed devices. NIST is a world-leader in developing frequency combs and this project seeks to enable advances in combs that will enable them to become ubiquitous in metrology and spectroscopy laboratories around the world.