The Department of Commerce, specifically the National Institute of Standards and Technology (NIST), intends to procure an Optical Wavelength Tunable Filter System through a sole source negotiation with Santec USA Corporation. This system is crucial for advancing NIST's research in integrated quantum photonics devices, including single-photon emitters and entangled photon sources, by enhancing capabilities in characterizing photon sources via narrowband filtering. The procurement falls under NAICS code 334516, which pertains to analytical laboratory instrument manufacturing, and responses from other interested parties must be submitted by June 20, 2025, to be considered, as no solicitation package will be issued. For further inquiries, interested parties can contact Robert Cowins at robert.cowins@nist.gov or Hing Pan Wong at hingpan.wong@nist.gov.