The Stellar Double Coronagraph (SDC) is an advanced high-contrast, small-angle coronagraphic instrument that carries out state-of-the-art high-contrast observations at very small angles from host stars on the Palomar 200 inch telescope. This work uses technologies similar to those proposed for potential coronagraphic exoplanet missions, such as the vortex and band-limited coronagraphs. The system works over a range of wavelengths, from the optical to the infrared.