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GLS-500029-00
SCHOTT S8612 absorbing near-IR filter glass. 1.1 mm requested finished thickness; BBAR / AR — One Surface. Review the 380–1100 nm spectrum, red-light transmission and IR rejection together. Cut size and fabrication confirmed by quotation.
Absorptive glass provides a gradual spectral roll-off rather than a fixed, abrupt cutoff. More thickness improves infrared rejection but also reduces useful visible and red transmission. Specify the edge definition and maximum allowed transmission across the entire blocked band; a single cutoff wavelength does not define blocking performance. Absorbed power becomes heat. No standalone NVIS compliance is implied.
| Wavelength | Internal transmission |
|---|---|
| 630 nm | 22.07% |
| 650 nm | 9.948% |
| 670 nm | 3.715% |
| 700 nm | 0.6111% |
| 800 nm | 0.001342% |
| 900 nm | <0.0003162% |
| 1000 nm | 0.001162% |
| 1100 nm | 0.01574% |
Calculated from published 1 mm reference data using Ti(d) = Ti(dref)d/dref. Values reported below the source limit are upper-bound estimates.
The graph covers 380–1100 nm, with the published 1 mm reference dashed and calculated 0.7, 1.1, 1.6, 2 and 3 mm curves. Source: SCHOTT S8612 datasheet, 03.05.2023, 10 nm reference samples. Calculations assume homogeneous glass and normal incidence. Internal transmission excludes surface reflection and coating effects; the graph does not establish total transmission of a finished coated filter.
1.1 mm is a requested custom finished thickness. Confirm blank size, polishing, thickness tolerance, clear aperture and edges. One surface specified for BBAR / AR treatment; define the coated face and useful band. AR is not itself an IR-blocking coating.
Lot tracked. Availability, dimensions and optical requirements are confirmed by quotation. Plotted thicknesses do not establish stock or fabrication feasibility.
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