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The model 671A is the most precise, measuring wavelength to an accuracy of ± 0.2 parts per million (± 0.0001 nm at 500 nm). For experiments that are less exacting, the model 671B is a lower-priced alternative with an accuracy of ± 0.75 parts per million (± 0.001 nm at 1500 nm).
To achieve the reliable accuracy needed for the most demanding applications, the 671 Laser Wavelength Meter is continuously calibrated with a built-in HeNe laser. This is the ideal reference source because its wavelength is well-known and fixed by fundamental atomic structure.
To achieve the highest accuracy, the model 671A uses a single-frequency HeNe laser that is stabilized using a balanced longitudinal mode technique. The model 671B uses a standard HeNe laser.
The 671 Laser Wavelength Meter operates with a PC connected directly by USB or through a local area network via Ethernet. Software is provided to control measurement parameters and to report wavelength data.
Since wavelength is calculated using an on-board digital signal processor, the 671 Laser Wavelength Meter can be integrated directly into an experiment using a library of commands for custom or LabVIEW programming. This eliminates the need for a dedicated PC and enables the use of any operating system.
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