Micro High Power Polarizing Beam Splitter Cube
The polarizing beam splitter cube is designed with precision for high-power lasers that split the incoming light into transmitted (P-light) and reflected light (S-light), depending on the state of polarization. This element plays a very important role in high-energy laser path control, power monitoring, optical modulation, and interferometry.
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: Cube bonding structure, optical path without offset, stable
- Multi-wavelength options:532nm, 633nm, 780nm, 808nm, 1064nm, 1550nm
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Hobbite offers a wide range of polarizing beam splitter cubes for various applications, such as laser processing, spectroscopic instruments, scientific research experiments, and communication modules with excellent polarization separation performance, thermal stability, and mechanical reliability by using high-precision optical substrates and low-absorption dielectric film systems.
Working Principle & Structure
The PBS cube consists of two right-angled prisms plated with a multi-layer dielectric polarized spectroscopic film on the glued interface. When light is at perpendicular incidence:
- P-polarized light transmits almost completely.
- S-polarized light is reflected 90°.
This principle, based on polarization-selective reflection, enables efficient light spectroscopy and energy distribution. IBS layers can maintain low absorption and high stability at high power conditions. The cube structure can effectively avoid the optical axis offset and ensure the stability of the system during long-term 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%
- Size range: 5mm–50mm, can be customized
Customization Options
- Wavelength customization: Supports 355nm–1550nm range
- Size can be customized: From 5mm to 50mm on the side
- Structural form: Cube, planar, or wedge-shaped polarized beamsplitter
- Material used: Fused silica, BK7, CaF₂, ZnSe, etc.
- Coating Solution: Single wavelength or multi-band polarization film
- Mechanical compatibility: Optional frame, threaded or flush mounting interface
Applications
- High-power laser processing system
- Laser resonator cavity and power monitoring module
- Optical communication polarization control unit
- Spectroscopic and interferometric systems
- Polarization spectroscopy module for scientific research and experiments
Design Considerations
- Wavelength matching: The coating should correspond strictly to the operating wavelength of the system
- Angle of Incidence Control: Usually 0°; deviations may affect spectroscopic performance
- Polarization dependence: Polarization-sensitive systems need an explicit choice of the polarizing beam splitter cube type
- Coating durability: IBS coatings are recommended for high-power applications
- Thermal stability: The material requires a low coefficient of thermal expansion
- Surface Cleanliness: Scattering and absorption damage due to contaminants or scratches
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% |
Angle of incidence | 0° (vertical incidence) |
Material | Fused silica / BK7 / CaF₂ |
Coating Type | Multilayer dielectric polarizing film |
Effective caliber | ≥90% |
Thickness range | 3mm–20mm |
Quality Inspection & Testing
- Optical surface shape inspection: Interferometer measurement with an accuracy of λ/20
- Parallelism detection: Angle interferometer or autocollimator measurement
- Coating uniformity inspection: Spectrophotometer measurement, uniformity of film thickness ≤ ±0.5%
- Laser Damage Threshold Test: ISO 21254, 10ns pulse, 1064nm
- Surface quality inspection:20-10 scratch/dent grade per MIL-PRF-13830B
All the PBS cubes pass interference-level surface shape detection and ISO laser damage testing to ensure a long-term stable operation with high reliability in high-power laser systems.
