Fresnel Rhomb Prism from Japan
A 45-90-45 degree prism using total internal reflections to convert linear polarization to circular polarization. Classified under HTS 9001.90.50.00 as an unmounted optical element for polarization state control in laser systems. Provides broadband quarter-wave phase retardation through double internal reflections.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
Import Tips
• Specify acceptance angle and wavelength range for polarization conversion efficiency
• Document surface quality critical for maintaining internal reflection efficiency
• Include material dispersion data for achromatic performance verification