Holographic Wire Grid Polarizers
 Click to EnlargeTransmitted intensity through one polarizer for incident light that is polarized parallel to the transmission axis.  Click to EnlargeTransmitted intensity through one polarizer for incident light that is polarized perpendicular to the transmission axis. Features- Polarize Light from 2 - 30 µm
- Extinction Ratios from 150:1 to 300:1 (See Specs Tab)
- Two Size Options: Ø25 mm and Ø50 mm
- Mounted in Double Protective Ring with Wire Orientation Indicated
Polarizers convert unpolarized (or randomly polarized) light into linearly polarized light. Thorlabs' holographic wire grid polarizers, which operate over the 2 - 30 µm spectral range (333 - 5000 cm-1), are specially designed for this difficult-to-access regime. They consist of an IR-transparent substrate, such as BaF2, CaF2, KRS-5 (thallium bromoiodide), or ZnSe, upon which linearly spaced grooves are fabricated using holographic methods. Metal is then deposited on these grooves to create a wire grid. Because the wire grid absorbs and reflects radiation that is polarized parallel to the grid, the transmitted radiation is perpendicular to the wires. Our holographic wire grid polarizers offers extinction ratios ranging from 150:1 to 300:1 and come premounted in either a Ø25 mm or Ø50 mm double protective ring mount. See the Specs tab for more details. The wires are oriented parallel to the white line engraved on the mount (see the photograph above). We recommend that the polarizers be used in pairs to provide smooth attenuation over the specified wavelength range and control over the output polarization direction. If two polarizers are used in series with their grids parallel, the achievable extinction ratio easily exceeds 20,000:1. Such polarizers are commonly used to polarize the output of unpolarized molecular lasers or to attenuate radiation from polarized sources. They can also be used to tune the output of a polarizing beamsplitter. Thorlabs also offers nanoparticle-based linear polarizers for the near- and mid-IR. | Note: The surface of a wire grid polarizer, like any diffraction grating, is extremely delicate, particularly for those fabricated from KRS-5. Never touch the surface of the polarizer, and only handle it by the edge. Careful removal of dust by gentle air flow is the only recommended cleaning procedure. |
|
| Material | BaF2 | CaF2 | KRS-5 | ZnSe |
|---|
| Extinction Ratio (Typical) | 150:1 (3 µm)
300:1 (10 µm) | 150:1 (3 µm)
300:1 (8 µm) | 150:1 (3 µm)
300:1 (15 µm) | 150:1 (3 µm)
300:1 (10 µm) | | Outer Diameter | 25 mm or 50 mm | | Clear Aperture | 18.0 ± 0.5 mm for Ø25 mm Polarizer
34.0 ± 0.5 mm for Ø50 mm Polarizer | | Wire Grid Spacing | 2700 Grooves/mm (Nominal) | | Substrate Thickness | 2.0 mm ± 0.5 mm | | Parallelism | ≤3 arcmin | | Surface Flatness | λ/20 @ 10.6 μm for Ø25 mm Size
λ/10 @ 10.6 μm for Ø50 mm Size | | Ring Thickness | 5.0 mm ± 0.2 mm | | Ring Diameter Tolerance | +0.0/-0.2 mm |
|
Loading...
|
|
( 0)
Holographic Wire Grid Polarizers
