The 20LP-NIR Precision Linear Polarizers is constructed by laminating a polymer polarizing film between two high-precision glass or fused silica windows. Each window has a high-efficiency 1100 to 1750 nm broadband NIR antireflection coating. The assembly is mounted in a 2 inch (50.8 mm) diameter black anodized aluminum housing for protectionand provides a 30.5 mm clear aperture. The transmission axis is clearly marked. The result is a linear polarizer with high transmission and low wavefront distortion that are easy to mount.
| Model | 20LP-NIR |
|---|---|
| Wavelength Range | 1200 to 1700 nm |
| Extinction Ratio | 1,000:1 minimum, 3,500 typical |
| Clear Aperture | 30.5 mm |
| Material | Grade A BK7 |
| Surface Quality | 40-20 scratch-dig |
| Damage Threshold | 1 W/cm2 CW, 0.2 J/cm2 with 20 nsec pulses, visible, typical |
| Diameter | 2.0 in. (50.8 mm) |
| Diameter Tolerance | ±0.13 mm |
| Transmitted Beam Deviation | ≤2 arc min |
| Polarizing Material | Polymer film |
| Transmission, Unpolarized Input, Parallel Pair | H0 >18% |
| Transmission, Unpolarized Input, Single Polarizer | TT >29% |
| Wavelength | 1100 nm |
| Wavelength | 1750 nm |
| Wavefront Distortion | ≤ λ/2 at 632.8 nm over the clear aperture |
