NE203B In Stock
Description: Unmounted 2" x 2" Absorptive ND Filter with a 0.3 Optical Density
| Part Number | NE203B |
|---|---|
| Category | Optics |
| Manufacturer | ThorLabs |
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The NE203B by ThorLabs is an absorptive neutral density (ND) filter that is unmounted, has a 0.3 optical density (OD), and is ideal for low-power applications. Measuring 2” x 2” in size, the NE203B is compatible with a wide array of fixed filter mounts, making it a versatile and convenient option for a range of optical setups.
The NE203B has a Schott glass substrate fabrication and in the 400 nm to 650 nm visible wavelength region, it boasts an spectrally flat absorption coefficient. The absorptive nature of the glass substrate is highly effective in decreasing multiple reflections from the filter, resulting in improved clarity and accuracy in measurements. It is recommended that the NE203B be calibrated in a setup before taking measurements, due to the variation that can occur between different glass units in the substrate.
| Optical Density (Transmission) | 0.3 (50%) |
| Filter Size | 2" x 2" |
| Dimensional Tolerance | +0.0 / -0.25 mm (H, L) |
| Clear Aperture | >45.7 x 45.7 mm |
| Surface Quality | 40-20 Scratch-Dig |
| Parallelism | <10 arcsec |
| Transmitted Wavefront Error (TWE) for OD < 1.3 | <2λ (@ 633 nm) |
| Surface Flatness for OD ≥ 1.3 | 2λ (OD = 1.3, 1.5) 2λ (OD = 2, 3, 4, 5, 6) (@ 633 nm) |
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Warranty:
Refurbished - 2 year warranty
New Surplus - 3 year warranty