For optical filters from Syronoptics.com, the standard Angle of Incidence (AOI) for specified transmission data depends on the category of the filter:
- Bandpass, Shortpass, and Longpass Filters: The standard AOI is 0° (normal incidence), typically with a tolerance of ±3°. Their baseline transmission curves and custom pricing are based on this 0° standard. If the angle of incidence increases beyond this, the filter will experience a "blue shift," where the center wavelength and transmission spectrum shift toward shorter wavelengths.
- Dichroic Mirrors, Cold Mirrors, and Hot Mirrors: The standard AOI for these components is typically 45°. This allows them to effectively separate wavelengths or manage heat by redirecting a light beam 90° relative to the original optical path.
- Polarizing Beamsplitters: These are also commonly optimized for a 45° AOI to effectively separate s-polarized and p-polarized light components.
When designing or requesting custom filters through their platform, an AOI of 0° is treated as the baseline, and any requirement for a non-normal incidence (an AOI greater than 5°) is considered a specialized factor that requires custom coating design.
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