The National Institute of Standards and Technology (NIST) is conducting market research through a Sources Sought Notice for the procurement of an Optical Reference Cavity, aimed at enhancing precision timekeeping and navigation capabilities. The required optical cavity must meet specific technical specifications, including high finesse and frequency stability across multiple wavelengths, to support NIST's research in nanophotonics and optomechanics. This equipment is critical for developing advanced metrology and sensing devices, and interested vendors are encouraged to submit their capabilities and relevant product information to the primary contact, Elizabeth Timberlake, at elizabeth.timberlake@nist.gov, by May 5, 2025. This notice serves solely for market research purposes and does not constitute a commitment to issue a solicitation or award a contract.