III-Nitrides have risen as the second most widely used semiconductor, making a phenomenal transition from laboratory discoveries to commodity applications of flat panel displays, Blu-ray DVDs, and solid-state lighting. AlN, in particular, is a unique material for nonlinear optics, possessing a wide bandgap and relatively strong quadratic and cubic optic nonlinearities. The presence of both nonlinear effects allows the production of a broad wavelength spectrum from a single IR pump laser. In this talk I will introduce epitaxial-AlN as a new platform for nonlinear optics, opening applications for optical physics and spectroscopy on a chip scale platform. I will first demonstrate how nonlinear AlN optical resonators facilitate simultaneous second harmonic generation and four wave mixing, enabling frequency comb generation at both IR and near-visible wavelengths. I will then show how this process can be extended across the visible spectrum to calibrate spectrographs for exoplanet research.