Free-Standing Wire Grid Polarizers - Specac
Free-Standing Wire Grid Polarizers - Specac
Free-Standing Wire Grid Polarizers - Specac
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illiant spectroscopy DataSheet<strong>Free</strong> <strong>Standing</strong> <strong>Wire</strong> <strong>Grid</strong>sExtremely efficient polarizers for themid-IR to millimeter wavelengths usingfree standing wire grids (unsupportedwires).The only requirement is that the wavelength is much greaterthan the wire spacing. The absorption of radiation in thewires is very low and the polarization efficiency is unaffectedby any small irregularities in the wire spacing at wavelengthssignificantly larger than the period (d) (λ>> d). At wavelengthsclose to the period (d), the polarization efficiency drops andbecomes a more complex function of the wire diameter andwire spacing.Tungsten or gold plated tungsten wires of 5, 10, 25 or 50µmdiameter, or beryllium-copper wire of 25 or 50µm, can bewound onto a support ring, or frame, and the wire spacingvaried between 12.5µm and 1.8mm according to customerrequirements.Mounts can be custom designed and fabricated in a choiceof material including aluminum, stainless steel, Invar, Tufnol,glass fiber and molybdenum. The wires can be bonded usingspecial adhesives depending on application.Features• Mid-IR to mm wavelengths, 20µm - >10mm• High degree of polarization• High transmission efficiency• No beam deviation or dispersion• Choice of materials and custom designApplications• Far-IR wavelength polarization• Interferometric Beamsplitters• Variable attenuation/reflection ofpolarized sources• Coupling devices for long wavelengthlasers (gas discharge or optical pumped)• Illustrations, descriptions and specifications in this data sheet werecorrect at the time of going to press. However, <strong>Specac</strong>'s policy is one ofcontinuous product development and we reserve the right to changedescriptions and specifications at any time. For the latest details pleasecontact your local <strong>Specac</strong> office or representative.www.specac.com
<strong>Free</strong> <strong>Standing</strong> <strong>Wire</strong> <strong>Grid</strong>sTransmission characteristics of free standing wire grid polarizersshowing effect of wire diameter and periodCurve wirediameterPeriod(µm), a (µm), da/d1 5 12.5 0.42 10 25 0.43 5 25 0.24 10 50 0.25 5 50 0.16 10 100 0.17 5 100 0.058 10 200 0.05A 5 25 0.2B 10 50 0.2C 5 100 0.05D 10 200 0.05Note: Curves A - D = 45o incidence(rotated about wire direction)Ordering informationPart NumberAnodized Aluminum Frame<strong>Wire</strong> Diameter (a) Period (d)O.D.(mm) I.D.(mm) Thick(mm) (µm) (µm)GS57200 50 25 10 5 12.5GS57201 50 25 10 10 25GS57202 80 50 12 5 12.5GS57203 80 50 12 10 25GS57204 105 75 12 5 12.5GS57205 105 75 12 10 25GS57206 130 100 12 5 12.5GS57207 130 100 12 10 25GS57100 140 120 12.7 10 25GS57110 140 120 12.7 10 50GS57130 133.35 95.25 12.7 10 25GS57135 133.35 95.25 12.7 5 12.5SPECAC LTD.,River House, 97 Cray Ave, St. Mary Cray, Orpington,Kent, BR5 4HE UKT : +44 (0)1689 873134 F : +44 (0)1689 878527E : sales@specac.co.uk Registered in England No. 1008689SPECAC INC.,50 Sharpe Drive, Cranston, RI 02920 USAT : Toll <strong>Free</strong> +1 800 447 2558E : sales@specac.co.uk W : www.specac.com<strong>Specac</strong> is part of Smiths Group plc22 - 06/11brilliant spectroscopy www.specac.com
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