High-Power Polarization Beam Displacer & Combiner

Product Characteristics

• High polarization purity: The polarization extinction ratio is >1000:1, ensuring efficient separation or beaming of s-light and p-light.
• Precise Beam Displacement: The displacement can be customized in the range of 0.5–2 mm, ensuring that the output beam is parallel.
• High transmittance and high reflectivity: Multi-layer dielectric film design, T>95%, R>99%, low light loss.
• Excellent optical flatness: Surface flatness up to λ/8 @632.8 nm, small wavefront distortion.
• High laser tolerance: Damage threshold >10 J/cm² @1064 nm, suitable for medium to high power laser systems.
• Strong environmental stability: The operating temperature ranges from -40°C to +200°C, allowing stable long-term operation in complex industrial and experimental environments.

Detailed Description

The device is constructed from a highly birefringent crystal—such as calcite, YVO₄, or BBO—in which the incident light is split into two orthogonally polarized beams (ordinary and extraordinary) to produce a parallel displacement. The crystal’s thickness, optical axis orientation, and angle of incidence are precisely engineered and assembled to achieve varying displacement distances with high polarization separation accuracy. A unique multicrystalline selection process and layer optimization minimize wavelength and polarization dependencies, ensuring parallel beam output with minimal angular deviation. Its compact design and high-precision assembly guarantee optical path stability, making the device ideal for high-precision optical applications such as interferometers, optical communication modules, and polarization imaging systems.

Typical Applications

• Laser interferometer and wavefront measurement system
• Polarization and beaming in optical communication modules
• Polarization imaging and microscopy systems
• Precision optical test and measurement instruments
• Laser polarization control and power monitoring

Materials and Manufacturing Processes

The substrate is made of high birefringent crystals (Calcite, YVO₄, or BBO) with excellent optical anisotropy and thermal stability. The optical surface is polished to 20-10 Scratch-Dig interference-grade flatness. The crystal bonding surface adopts a multi-layer dielectric film and an AR film (R<0.5%) on the inlet and outlet surfaces to improve transmission efficiency and reduce light loss. The overall thickness tolerance is ±0.02 mm, and the optical axis consistency is tightly controlled, ensuring high-precision performance and long-term stability. It is recommended to install it in a package to reduce the impact of temperature and humidity changes on performance.

Design Considerations

The appropriate displacement distance is selected according to the optical path of the system, and the wavelength band of the film layer is matched to reduce the reflection loss. During installation, ensure that the fixed surface is flat and the optical axis is concentric to avoid beam deviation.

High-precision systems are recommended to be packaged or fixed to ensure stable and long-term reliability of the optical path. For special bands or laser power systems, custom crystal thickness and layer optimization solutions are available to meet specific application needs.