Description: Tunable laser spectrometers are used by NASA for investigations of planetary atmospheric constituent gases. The availability of widely tunable long-wavelength (3 to 12?Ym) lasers operating at room temperature would allow such spectrometers to a wider range of gas species detection sensitivity increased by orders-of-magnitude relative to near-infrared lasers currently used in these applications. Aculight proposes to demonstrate a novel mid-infrared laser technology capable of room temperature operation at any wavelength between 2 and 17?Ym. We will demonstrate, for the first time, continuous wave optical parametric oscillation in the new nonlinear material, orientation-patterned Gallium Arsenide (OP-GaAs) and show that it can be pumped by low cost, compact fiber-based sources developed for the telecommunications industry.