This is a market research Sources Sought notice, not a solicitation, for a Multiwavelength Tunable Stable Optical Cavity System. The National Institute of Standards and Technology (NIST) is seeking information from vendors to determine if a small business set-aside is possible. The product must be manufactured in the U.S., and respondents must indicate the country of manufacture. No budget or performance location is specified in this notice. Responses are due by the date and time posted in the notice.