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Rochon Polarizers

Wide Wavelength RangeHigh Extinction RatioLarge Field AngleCemented, Suitable for low power applicationSplit the ordinary and extraordinary ray, but only ordinary beam is deviatedRoHS Compliant

Specifications

Material: YVO4, Other
Wavelength Range: 500 – 2300 nm
Max Extinction Ratio: >= 10,000:1
Wavefront Distortion: <= Lambda/4
Surface Quality (Scratch-Dig): 20-10

Rochon Polarizers: Precision Polarization Control for Optical Systems

Rochon polarizers are specialized optical devices designed to split an incoming light beam into two orthogonally polarized components. Unlike some other polarizing prisms, Rochon polarizers transmit the ordinary ray undeviated while the extraordinary ray is refracted at a specific angle. This unique characteristic makes them invaluable in applications requiring precise beam separation and polarization control.

Design and Functionality

A Rochon polarizer consists of two birefringent prisms, typically made from materials like calcite, α-BBO, quartz, or YVO₄, cemented together. In the first prism, both the ordinary and extraordinary rays propagate collinearly. Upon entering the second prism, the ordinary ray continues along the same path, while the extraordinary ray experiences a change in refractive index, causing it to deviate. This design ensures that the two output beams are linearly polarized and spatially separated, facilitating their use in various optical applications.

Key Features

  • High Extinction Ratio: Rochon polarizers offer excellent polarization purity, with extinction ratios reaching up to 100,000:1, depending on the material used.

  • Broad Wavelength Range: These polarizers are effective across a wide spectral range, from ultraviolet to mid-infrared, making them versatile for different applications.

  • Compact and Robust Design: The cemented prism construction ensures durability and compactness, suitable for integration into various optical systems.

  • Minimal Beam Deviation: The undeviated transmission of the ordinary ray allows for straightforward alignment in optical setups.

Applications

Rochon polarizers are employed in a variety of fields:

  • Spectroscopy: For analyzing the polarization properties of materials and substances.

  • Laser Systems: To manage and manipulate the polarization state of laser beams.

  • Optical Instrumentation: In devices requiring precise beam separation and polarization control.

  • Imaging Systems: To enhance contrast and reduce glare by controlling polarized light.

Selection Considerations

When choosing a Rochon polarizer, consider the following factors:

  • Material Compatibility: Select a material that aligns with your application's wavelength requirements.

  • Extinction Ratio Needs: Ensure the polarizer meets the polarization purity necessary for your system.

  • Physical Dimensions: Match the polarizer's size and aperture to your optical setup.

  • Coating Requirements: Depending on the application, anti-reflective coatings may be necessary to enhance performance.

At FindLight, we offer a curated selection of Rochon polarizers from leading manufacturers, suitable for various optical applications. Explore our catalog to find the ideal polarizer that meets your specific requirements.

Did You know?

Rochon Polarizers consist of two birefringent prisms made from materials like Calcite cemented together. The ordinary and extraordinary rays remain collinear and propagate through optical axis through the first prism. Upon entering the second prism, the ordinary rays do not experience a change in the refractive index and pass through the prism without deviation, while the extraordinary rays refract at the interface. Rochon Polarizers offers the advantages like high polarization purity, high transmittance, wide wavelength range, wide acceptance angle, o-ray passing through with little deviation.