The National Institute of Standards and Technology (NIST) is conducting market research to identify vendors capable of supplying an Ultrastable Optical Reference Cavity System for 1396nm. This is a sources sought notice, not a solicitation, and no contract will be awarded from this announcement. Responses must include the country of manufacture, and the government will use the results to determine if a small business set-aside is possible. No budget amount or performance location is specified in the notice. Interested parties should submit a capability statement by the deadline indicated in the notice.