NASA's National Aeronautics and Space Administration (NASA) is seeking to procure lasers and photodiodes for the design of a Primary Constituent Monitor (PCM) through a sole source contract with HAMAMATSU CORP, the only provider meeting the necessary specifications. The procurement will include 56 units each of a 2003 nm and a 1393 nm Vertical Cavity Surface Emitting Laser, both equipped with photodiodes, and is scheduled to take place from April 2 to June 30, 2025, at NASA's Johnson Space Center in Houston, Texas. This initiative is crucial for advancing monitoring capabilities in various scientific applications, ensuring adherence to quality standards throughout the procurement process. Interested parties may submit their qualifications in writing to Cara Craft at cara.s.craft@nasa.gov by 1 p.m. Central Standard Time on April 25, 2025, to potentially influence the decision on whether the procurement will proceed competitively or remain sole source.