Neutral density filter measurements at the National Institute of Standards and Technology

Gentile, Thomas R.; Frenkel, Anatoly; Migdall, Alan L.; Zhang, Z.M.

doi:10.1016/s0926-4345(06)80011-8

Cited by 4 publications

(2 citation statements)

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“…[2][3][4] Recent advances in stable laser sources and highly sensitive detectors have allowed accurate determination of the spectral transmittance of filters with extremely low transmittance. [5][6][7][8] As reviewed by Gentile et al, 9 both direct and heterodyne detection methods have been employed for measuring transmittance with a dynamic range as large as 10 decades at wavelengths of 633 nm ͑He-Ne line͒, 1064 nm ͑Nd:YAG line͒, and 10.2 and 10.6 m ͑CO 2 lines͒.…”

Section: Introductionmentioning

confidence: 99%

Transmittance measurements for filters of optical density between one and ten

et al. 1997

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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.

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Section: Introductionmentioning

confidence: 99%

Transmittance measurements for filters of optical density between one and ten

et al. 1997

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“…Both techniques suffer from the intrinsic limits of the detector and cannot measure very high (> 9 or so) ODs directly. Of course, using a more powerful laser, a more sensitive detector and phase-sensitive or heterodyne detection [5] can push the detection envelope up to higher OD levels, [6] but there are always limits. Many modern filter designs have ODs up to 20 or more.…”

Section: Discussionmentioning

confidence: 99%

Measuring Sharp Spectral Edges to High Optical Density

Zitner¹,

Carver²,

Locknar³

et al. 2013

Society of Vacuum Coaters 56th (2013) Annual Technical Conference Proceedings

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Interference filters have improved over the years. Sharp spectral edges (> 1 db/nm) reach high optical density (OD > 8) in a few nm. In-situ optical monitoring to within 0.1 % error enables these levels of performance. Due to limitations related to f-number and resolution bandwidth, post-deposition testing in typical spectrophotometers cannot reveal the quality of today's filters. Laser based measurements at selected wavelengths prove that blocking above OD8 to OD9 is manufacturable with high yield. This paper compares modeled spectra and laser based measurements.

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