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EKSMA Optics
Polarizing Optics | EKSMA Optics

Polarizing Optics | EKSMA Optics

Product catalog summary

Polarizing Optics Overview
This document provides detailed specifications and descriptions of various polarizing optical components offered by EKSMA Optics. These components are designed to modify the state of polarization of optical radiation, which is crucial for applications involving laser beams and other optical systems.

Brewster Windows
Brewster windows are used for high-energy laser beams within cavities. They transmit 100% of p-polarization components and reflect 20% of s-polarization components. Key specifications include material options like BK7 and UV FS, surface quality of 20-10 scratch & dig, surface flatness of λ/10 @ 633 nm, transmission efficiency of tp>95%, and a laser damage threshold of 10 J/cm² at 1064 nm.

Thin Film Laser Polarizers
These polarizers achieve linear polarization of laser radiation and are suitable for demanding laser applications due to their high laser damage threshold. They are most efficient at a 56° angle of incidence (Brewster angle) with transmission at 800 nm: Rs/Tp > 99.5/95.0%.

Cube Polarizing Beamsplitters
These beamsplitters are durable and optimized for popular laser wavelengths, utilizing polarization occurring on reflection deviated by a 90º angle. They are made from materials like BK7 and UV FS, with a surface quality of 40-20 scratch & dig and a laser damage threshold of 0.3 J/cm² at 1064 nm.

Glan Laser Polarizing Prisms
These prisms transmit a linearly polarized extraordinary beam without deviation and are available in natural calcite or α-BBO materials. They are suitable for applications requiring high polarization purity, with a wavelength range of 220–2300 nm and an extinction ratio of 1:10^-5.

α-BBO Glan Laser Prisms
These prisms offer a wide transmittance wavelength range and are mounted in black anodized aluminum, with a transmittance wavelength range of 200–3500 nm and an extinction ratio of 1:10^-5.

Wollaston Prism Polarizers
Made from high-quality natural calcite, these polarizers consist of two equal calcite prisms. They offer a wavelength range of 300–2200 nm and have an extinction ratio of 1:10^-5. The separation angle can be 10 or 20 degrees, with dimension tolerance of ±0.25 mm.

Rochon Polarizing Prisms
Composed of two α-BBO prisms, these polarizers are suitable for ultraviolet light and can be customized for specific wavelengths. They have a wavelength range of 200–3500 nm, an extinction ratio of 1:10^-5, and a beam deviation of less than 3 arcmin.

Quartz Retardation Plates
These plates are used to rotate the direction of polarization or convert linear to circular polarization. They are made from high-quality crystalline quartz and are available in quarter-wave and half-wave versions.

Achromatic Waveplates
Made from crystal quartz and magnesium fluoride, these waveplates have a retardation tolerance better than λ/100 over the entire wavelength range, ideal for use with tunable lasers and multiple laser-line systems.

Zero Order Dual Wavelength Waveplates
These waveplates are designed to operate at both the fundamental and second harmonic wavelengths of Ti:Sapphire lasers, offering high polarization purity.

Multiple Order Waveplates
These are made from a single crystalline plate and are less temperature and wavelength dependent than zero-order plates, suitable for high-power laser applications.

Housing Accessories
The document also mentions various polarizer holders and mounts available for these optical components, ensuring precise alignment and stability during use.

Specifications
Key specifications include thickness (T) of 6–20 mm, surface quality of 20-10 scratch & dig, wavefront distortion of λ/10, parallelism of less than 10 arcseconds, anti-reflective coating with reflectance less than 0.2%, and a laser damage threshold of 5 J/cm² for a 10 nsec pulse at 1064 nm.

Polarization Plane Rotators
Made from crystalline quartz, these devices rotate the polarization plane of a beam to a specific angle using circular birefringence, suitable for specific wavelengths and slightly affected by ambient temperature.

Product Catalogue
Various models are available with center wavelengths ranging from 266 nm to 1064 nm, with rotation angles of 45° or 90°.

Fresnel Rhombs
Used to rotate polarization and operate over a wide wavelength range, achromatic due to low dispersion of refractive index. Air-spaced Fresnel Rhombs are available for high power applications.

Fresnel Rhombs Specifications
Materials include BK7 and UV FS, with wavelength ranges of BK7 (400–2000 nm) and UV FS (210–400 nm), surface quality of 20-10 scratch & dig, surface flatness of λ/10 at 633 nm, and a laser damage threshold greater than 0.5 J/cm² for a 10 nsec pulse at 1064 nm.

Catalog excerpts

Polarizing Optics valuable information about where the light has been and the various physical parameters which have been acting upon it. This section describes a group of components which modify the state of polarization of optical radiation. Polarized light carries Brewster Windows ● Transmit 100% p-polarization components ● Reflect 20% s-polarization components Windows & Filters Polarizing Optics Brewster windows are intended for high energy laser beams intra cavity usage. Wavefront distortion Clear aperture Axis tolerance Thickness tolerance ● Provide the achievement of strictly linear polarization of laser radiaton ● Utilise the polarization wich occurs on reflection from a plane surface Diameter tolerance Thickness tolerance Clear aperture Surface flatness Material Surface quality Brewster angle Standard size is up to Ø50 mm (2”), while max. available dimensions are 100×200 mm. For optimal transmission a Thin Film Polarizer should be mounted in an appropriate holder for angular adjustment. Transmission, % Percent transmission Thin Film Polarizers are designed for use in the most demanding lasers. Due to a high laser damage threshold reaching 10 J/cm² @ 1064 nm 8 ns, they are used as an alternative to Glan laser polarizing prisms or cube polarizing beamsplitters. Typical applications are intracavity Q-switch hold-off polarizers or extracavity attenuators for Nd:YAG lasers. Thin Film Polarizers can be used at an > 40° angle of incidence, but polarization is most efficient and appears in a broad waveength range at 56° AOI (Brewster l angle). Typical polarization ratio TP/TS is 200:1. Thin Film Laser Polarizers Visit www.eksmaoptics.com for new products and prices Polarizing Optics Catalogue number Extinction ratio Tp/Ts Laser damage threshold Please contact us for other Brewster windows size or precision requirements. Surface quality 10 J/cm2 10 nsec pulse at 1064 nm typical

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Optical Components BK7 Round Thin Film Polarizers UV FS Round Thin Film Laser Polarizers Catalogue number Catalogue number Please add letter M to the catalogue number for metric dimensions and letter E for English. BK7 Rectangular Thin Film Laser Polarizers Rs / Tp > 99.5 / 95.0 % Catalogue Rectangular dimensions Thickness Wavelength, Price, number Length, mm Width, mm T, mm nm EUR 28.6 Please add letter M to the catalogue number for metric dimensions and letter E for English. UV FS Rectangular Thin Film Laser Polarizers Rs / Tp > 99.5 / 95.0 % Catalogue Rectangular dimensions Thickness Wavelength,...

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Polarizing Optics Ultra High Transmission Thin Film Polarizers 420-1254UHT. Ultra High Transmission @ 532 nm, Ts<0.2%, Rp<0.2%, AOI = 56° 420-1258UHT. Ultra High Transmission @ 1064 nm, Ts<0.2%, Rp<0.2%, AOI = 56° High Transmission Thin Film Polarizers 420-1248HT. High Transmission @ 1030 nm, Rs/Tp > 99.5/99.0% 420-1258HT. High Transmission @ 1064 nm, Rs/Tp > 99.5/99.0%. Wollaston Prisms See page 1.50 Catalogue number Polarizing Optics Visit www.eksmaoptics.com for new products and prices Glan Laser Polarizing Prims 420-1254HT. High Transmission @ 532 nm, Rs/Tp > 99.5/99.0% 420-1252HT. High Transmission...

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Optical Components Cube Polarizing Beamsplitters Coatings The four outer faces are all anti-reflection coated. ● Durable and convenient ● Optimised for popular laser wavelengths Polarizing film is coated on the internal face of a cube beamsplitter. Thin film polarizers utilize the polarization which occurs on reflection deviated by 90º angle. Cube polarizing beamsplitters can be optimized for a particular wavelength to give superior performance for laser application can be optimised for a particular wavelength to give superior performance for laser applications. Please contact us for polarizing...

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Polarizing Optics Glan Laser Polarizing Prisms ● Transmit a linearly polarized extraordinary beam without deviation from its initial direction ● Reflect an ordinary ray out of the prism into either the black glass or the escape port ● Air-spaced prisms ● Available with two, one or no escape ports in mounts for extra power capacity Glan laser polarizers are manufactured from the finest optical grade natural calcite or α-BBO. They are useful in applications requiring a high degree of polarization purity, high total transmission and low, medium or high power requirements. Windows & Filters We also...

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Optical Components α-BBO Glan Laser Prisms SPECIFICATIONS Coatings Transmittance wavelength range Extinction ratio Surface quality Wavefront distortion Beam deviation Angular field Black anodized aluminium Operating wavelength range, nm Catalogue number Mounted, without adapter Price, EUR Catalogue number Mounted, with adapter Mounting Suggestion Example of M2Pd mount with adapter for α-BBO Glan Laser Prisms with outer diameter mount of 25.4 mm. Solid Base Height Extenders 820-0210 Polarizing Optics UV & IR Optics Polarizer Holders 840-0180-A1 for prisms with outer diameter of 25.4 mm and 840-0180-A2...

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Polarizing Optics Specifications Material Surface quality Dimension tolerance For mount's drawing and mounting suggestion, see page 1.48. Prisms mounted in black aluminium mounts M2P or M2Ps are available. Catalogue number Other sizes, better quality, different spectral ranges or AR coatings are available on request. To order wollaston prism with a AR coating (see page 1.5) add the catalogue number and coating price to the prism code and price. Wollaston prism polarizers consist of two equal calcite prisms. Both output beams are almost equaly deviated. Angular separation of output beams depends...

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Optical Components Quartz Retardation plates Coatings They rotate the direction of polarization (λ/2) or convert linear into circular polarization or vice versa (λ/4). ● Made from high quality optical grade crystalline quartz ● Quarter wave and half wave retardation versions available ● Multiple-order, low-order or zero-order plates ● Suitable for high and low power laser applications Zero Order Optically Contacted Waveplates ● Easily aligned ● Temperature insensitive ● Moderately insensitive to wavelength These are formed from two thin sections which are polished to different thicknesses to...

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