Fabry-Perot Interferometer Spacer
Precision invar spacer tube maintaining cavity length in Fabry-Perot laser spectrum analyzers. Falls under HTS 9013.90.70.00 as an optical instrument part.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If bulk alloy steel tubes
Metal tubes without optical specifications go to Chapter 72/73.
If wavelength measuring interferometers
Measuring function takes precedence per chapter note 5.
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Import Tips & Compliance
• Specify thermal expansion coefficient (1.2×10^-6/°C) proving precision function
• Include finesse calculation data showing spacer criticality
• Document material certification for dimensional stability
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