title: Transmittance measurements for filters of optical density between one and ten.
abstract: We have developed a facility for measuring the transmittance of optical filters at a wavelength of 1064 nm, using a Nd:YAG laser, a power stabilizer, and linear photodiode detectors. A direct measurement method was used for filters with optical densities (OD's) less than or equal to 4, and a reference substitution technique was used for filters with OD's as great as 10. The apparatus and data-acquisition system are described. Measurement results for a set of filters are presented. The expanded uncertainties for the measured OD and deduced absorption coefficient are determined through a detailed analysis of all the uncertainty components.
authors.forename: Z M
authors.initials: ZM
authors.lastname: Zhang
authors.forename: T R
authors.initials: TR
authors.lastname: Gentile
authors.forename: A L
authors.initials: AL
authors.lastname: Migdall
authors.forename: R U
authors.initials: RU
authors.lastname: Datla