Department of Commerce, Mountain Administrative Support Center, Procurement Division, MC3, 325 Broadway, Boulder, CO 80303-3328

59 -- CRYOGENIC RADIOMETER SYSTEM SOL 51RANB50C110 DUE 080395 POC Procurement Technicians, (303) 497-3221 The National Institute of Standards and Technology (NIST) requires a cryogenic radiometer system for measuring the optical power produced by a laser source. The cryogenic radiometer system consists of three main parts: the cryogenic system, the optical system, and the electronic system. The cryogenic system (cryostat) shall consist of the cryogenic cooling mechanism used to achieve cryogenic temperatures, and the associated vacuum enclosure. An open system is required which uses both liquid nitrogen and liquid helium containers and heat shields, and has a regulated heat sink. The optical system shall be optimized for the collimated coherent light produced by laser sources. It shall have a high efficiency optical cavity, a window that can be adjusted to the light's Brewster angle, and a valve which allows the window to be removed from the cryostat system without losing vacuum in the cryostat. The electronic system shall include temperature controllers for both the heat sink and optical cavity. The electronics shall be computer controlled, and software that initializes the electronic components and performs or initializes the electrical substitution shall also be included. (0178)

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