Request InfoBristol Instruments Inc.The 621 laser wavelength meter introduced by Bristol Instruments Inc. uses optical interferometry to measure wavelength with high accuracy, reliability, versatility and convenience. Model 621A measures absolute wavelength with ±0.2-ppm accuracy, and the 621B delivers an accuracy of ±1.0 ppm. The built-in wavelength standard performs continuous calibration. Various versions operate from 350 nm to 4.0 µm. The devices are suitable for high-resolution laser spectroscopy, photochemistry and optical remote sensing.See full productRelated content from Photonics MediaPRODUCTSVision Spectra Autumn 2023 Issue3D Laser ScannerThe Absolute Scanner AS1-XL modular 3D laser scanner from Hexagon AB is designed for large surface inspection. 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The...PHOTONICS BUYERS' GUIDE CATEGORIESCurrent MonitorsLaser AmplifiersRanging, Navigation and Tracking Laser SystemsOptical Air Pollution Measurement and Control SystemsCOMPANIESPhotonics Buyers' GuideOptikos CorporationThe Optical Engineering Experts® Optikos designs and manufactures metrology products for measuring and assuring optical image quality; and provides optical engineering design, development,...Photonics Buyers' GuideFOCtek Photonics Inc.FOCtek provides customers with all types of custom manufactured lenses, Precision Optical Components, Polarizing Optics, Prisms, Filters, Coatings, Optical Systems, Crystals, Nonlinear Crystals,...Photonics Buyers' GuideOhara CorporationOHARA manufactures more than 130 environmentally safe optical glass types, free of both lead and arsenic. 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