Interferometer Reference Mirror
A super-polished flat mirror mounted in a vibration-isolated holder for use as a reference surface in laser interferometers for precision metrology. Classified in HTS 9002.90.40.00 for its role in mounted optical measuring instruments.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for optical measuring instruments
Chapter note prioritizes 9031 for measuring optics over general 9002.
If for machine tools
Mirrors for section XVI machinery like CNC excluded by note 1(g).
If optically worked but without mount
Lacks mounting, shifting to filters/lenses subheading.
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Import Tips & Compliance
• Certify flatness specs (e.g
• lambda/20); specify instrument compatibility; declare value based on optical quality not substrate
Related Products under HTS 9002.90.40.00
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Holography Reconstruction Mirror
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Schlieren Imaging Mirror
A large parabolic mirror pair mounted for flow visualization in schlieren wind tunnel imaging systems. Classified HTS 9002.90.40.00 as mounted optics for aerodynamic research apparatus.
Beam Expander Mirror Set
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Mounted Dielectric Laser Mirror
A high-reflectivity dielectric mirror mounted in a precision optical holder, designed for use in laser cavities or beam steering systems within scientific instruments. It falls under HTS 9002.90.40.00 as a mounted optical mirror that is a part or fitting for optical apparatus, excluding unworked glass mirrors.
Precision Aluminum Coated Mirror Mount
An aluminum-coated front-surface mirror securely mounted in an adjustable kinematic mount for alignment in interferometers or spectrometers. Classified under HTS 9002.90.40.00 as a mounted mirror fitting for optical instruments, distinct from simple reflective glass.