Description
Features
Polarize Light from 2 – 30 m
Extinction Ratios from 150:1 to 300:1 (See Specs Tab)
Two Size Options: 25 mm and 50 mm
Mounted in Double Protective Ring with Wire Orientation Indicated
Polarizers pass linearly polarized light while blocking the orthogonal polarization from an unpolarized (or randomly polarized) light source. Thorlabs’ holographic wire grid polarizers, which operate over the 2 – 30 m 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. The orientation of the wires is marked by a line (see diagram to the right). Please note that this is different from our other wire grid polarizers.
These holographic wire grid polarizers offer extinction ratios ranging from 150:1 to 300:1 and come premounted in either a 25 mm or 50 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.
Manufacturer:Electronic Components
Datasheet:Barium-Fluoride_MSDS.pdf
