Miniature Polarizing Beamsplitter (PBS) Cemented Prism
The Polarizing Beamsplitter (PBS) Cemented Prism is a high-precision polarizing optical component designed to separate incident light into transmitted and reflected beams based on polarization state. Typically, p-polarized light is transmitted while s-polarized light is reflected, maintaining stable optical paths and high performance. This device is widely used in interferometry, laser systems, optical communication modules, microscopic imaging, and high-precision optical setups, ensuring efficient polarization separation and long-term stability.
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Key Features
High Polarization Separation: Precisely separates s- and p-polarized light with high purity in both reflected and transmitted beams. Extinction ratios can exceed 1000:1, enabling high-precision polarization control.
High Optical Quality: Features surface flatness up to λ/8 @632.8 nm and low wavefront distortion, meeting the stringent requirements of interferometers and microscopy systems.
High Laser Damage Threshold: Withstands medium to high-power laser irradiation >10 J/cm² @1064 nm, suitable for scientific and industrial laser applications.
Environmental Stability: Operational temperature range spans from -40°C to +200°C, ensuring reliability in both laboratory and industrial environments.
Compact Design: The cemented cubic structure, combined with precision alignment, minimizes optical axis deviation and angular error for easy system integration.
Detailed Description
The PBS Cemented Prism is constructed by optically bonding two high-precision right-angle prisms at the hypotenuse interface, which is coated with a polarization-selective dielectric film. Incident light is separated at this coating: p-polarized light is predominantly transmitted, and s-polarized light is predominantly reflected. The coating’s thickness and refractive index are optimized to achieve a high extinction ratio and low optical loss, guaranteeing polarization purity and system stability.
The compact cubic design and precise alignment ensure optical path consistency, making the PBS Cemented Prism a reliable component for interferometers, laser beam splitting, optical communication modules, and microscopic imaging equipment.
Typical Applications
- Beam splitting and polarization control in laser systems
- Interferometers and wavefront detection systems
- Power monitoring and signal separation in optical communication modules
- Scientific imaging and micro-optical (MEMS) systems
- Optical testing and precision measurement instruments
Materials & Manufacturing
- Substrate: BK7 or Fused Silica, offering high transmittance and a low coefficient of thermal expansion.
- Surface Quality: Polished to 20-10 Scratch-Dig specification with interferometric-grade flatness of λ/8.
- Coating: Polarization-selective multilayer dielectric coating on the hypotenuse; Anti-Reflection (AR) coating on entrance/exit surfaces with R <0.5%.
- Bonding: Precision optical bonding ensures optical path stability and long-term reliability.
- Mounting: Housing or secured mounting is recommended to minimize performance impact from environmental factors.
Customizable Parameters
Parameter | Options | Description |
Polarization Splitting Orientation | s-reflected, p-transmitted | Polarization orientation can be adjusted per system requirements. |
Extinction Ratio | ≥1000:1 (Customizable) | Ensures high polarization purity. |
Operating Wavelength | 400–700 nm, 700–1100 nm, 1064 nm, or Custom | Coatings optimized for specific wavelength bands. |
Substrate | BK7, Fused Silica, or Custom | Selected based on thermal expansion, transmittance, and mechanical strength. |
Surface Flatness | λ/8 @632.8 nm | Interferometric-grade flatness to minimize wavefront distortion. |
Surface Quality | 20-10 Scratch-Dig | Controlled to reduce light scattering and ensure high optical performance. |
Laser Damage Threshold | >10 J/cm² @1064 nm | Suitable for medium to high-power laser systems. |
Operating Temperature | -40°C ~ +200°C | Applicable in industrial and laboratory environments. |
AR Coating (R) | <0.5% | Enhances transmittance and reduces optical loss. |
Angular Tolerance | ≤2 arcmin | Ensures optical path consistency. |
Cube Size | 5×5×5 mm ~ 50×50×50 mm or Custom | Tailored to optical design and beam path requirements. |
Bonding Method | Precision Optical Bonding | Guarantees long-term stability of the optical path. |
