Finely Polished Polarizing Beamsplitter Plate (PBS Plate)
A polarizing beamsplitter plate is a high-precision optical component that divides the incident light into transmitted light (P light) and reflected light (S light), according to the polarization state of light. The PBS beamsplitters are increasingly in demand for use in laser systems, optical measurements, interferometers, optical communication modules, and scientific research experiments due to their efficiency in optical power distribution and polarization control.
Features
- High power tolerance: laser damage threshold ≥10 J/cm²@10ns
- High polarization contrast:P light transmittance >98%, S light reflectance >99.5%
- High optical accuracy: surface flatness λ/[email protected] nm, parallelism ≤3″
- Stable structure: flat structure, the optical path is stable, and not offset after installation
- Multi-wavelength options:532nm, 633nm, 780nm, 808nm, 1064nm, 1550nm
Share to:
Hobbite polarization splitters are made with high-precision optical substrates and low-absorption media films. They combine excellent polarization separation performance, thermal stability, and mechanical reliability for long-term stable operation in high-power lasers and precision optical systems.
- Thickness range: 1mm–10mm, customizable according to system requirements
- Dimensional tolerance: ±0.1mm
- Angle of incidence: 0°–45° (adjustable)
Working Principle & Structure
A multi-layer dielectric polarization film is coated on the surface of the PBS parallel optical plate to achieve polarization-selective reflection and transmission. When light is incident vertically or at a specific angle:
- P-polarized light is transmitted almost completely.
- S-polarized light is partially or almost fully reflected, depending on the scale of the membrane design.
The structure applies the principle of polarization-selective reflection for effective energy distribution and is suitable for polarization control modules, interferometry, and power monitoring. Hobbite adopts an IBS or E-beam evaporation process to achieve dense, low-absorption layers stable even under high-power operation.
Material & Manufacturing
- Base material: fused silica / BK7 / CaF₂
- Coating method: ion beam sputtering (IBS) or electron beam evaporation
- Flatness: λ/10 @ 632.8nm
- Parallelism: ≤3″
- Effective caliber: ≥90%
- Thickness range: 1mm–10mm
- Dimensional tolerance: ±0.1mm
Customization Options
- Wavelength customization: 355nm–1550nm optional
- Size customization: Side length 3mm–100mm
- Structural form: Flat plate, wedge, or other special shape
- Substrate materials: Fused silica, BK7, CaF₂, ZnSe, etc.
- Coating solution: Single wavelength or multi-band polarization film
- Mechanical compatibility: Outer frame, threaded, or recessed interface
Applications
- Laser resonator cavity and polarization control module
- Optical power monitoring and energy distribution system
- Spectrometers and interferometry instruments
- Scientific research experiment and precision polarization measurement module
- Optical communication polarization control unit
Design Considerations
- Wavelength matching: The coating should be strictly according to the operating wavelength of the system
- Angle of incidence control: Variations from the design angle will affect performance
- Polarization dependence: Selection of the right type of PBS for polarization-sensitive systems
- Coating durability: For high-power applications, IBS coatings are recommended
- Thermal stability: The material must have a low coefficient of thermal expansion
- Surface cleanliness: Any contamination or scratches can lead to scattering and absorption damage
Standard Parameters
Item | Parameter range / standard value |
Working wavelength | 532nm / 633nm / 780nm / 808nm / 1064nm / 1550nm |
Polarization Separation | P Light Transmittance >98%, S Light Reflectance >99.5% |
Laser damage threshold | ≥10 J/cm² @ 10ns |
Material | Fused silica / BK7 / CaF₂ |
Coating type | Multilayer dielectric polarizing film |
Flatness | λ/10 @ 632.8nm |
Effective caliber | ≥90% |
Dimensional tolerance | ±0.1mm |
Angle of incidence | 0°–45° (adjustable) |
Thickness range | 1mm–10mm |
Quality Inspection & Testing
- Optical surface shape detection: Interferometer measurement with λ/20 accuracy
- Parallelism detection: Angular interferometer or autocollimator
- Coating uniformity inspection: Spectrophotometer measurement, film thickness uniformity ≤ ±0.5%
- Laser Damage Threshold Test: ISO 21254 standard, 10ns pulse, 1064nm
- Surface quality inspection: MIL-PRF-13830B standard, 20-10 scratch/dent rating
The interferometric surface detection and ISO laser damage testing of all PBS splitters guarantee long-term stability and reliability of high-power laser systems.
