70R/30T VIS Non-polarizing Broadband Beamsplitter
70R/30T VIS Non-polarizing Broadband Beamsplitter is designed to reflect 70% and transmit 30% of incident light across VIS 350-700nm. Coligh manufactures optical beamsplitters.
- 70% Reflection / 30% Transmission Ratio
- Broadband Performance
- Non-Polarizing Design
- Flexible Configurations
- IAD Hard Coating
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Dielectric Non-Polarizing Broadband Beamsplitter 70/30 Ratio Description
The 70R/30T VIS Non-Polarizing Broadband Beamsplitter is a high-performance optical component specifically designed for the 350–700 nm visible wavelength range, precisely achieving a 70% reflection (R) and 30% transmission (T) ratio. Its non-polarizing and broadband anti-reflection characteristics make it a key element in complex optical systems.
- This beamsplitter delivers consistent 70% reflection and 30% transmission within 350–700 nm, meeting the needs of applications requiring accurate light intensity distribution.
- Broadband optimization across the entire visible spectrum—from blue and cyan to orange and red—ensures stable splitting performance in fluorescence imaging, multispectral analysis, and other applications sensitive to wavelength shifts.
- The non-polarizing design ensures that the reflection/transmission ratio remains insensitive to the polarization state of the incident light, eliminating energy loss from linear or circular polarization and ensuring data reliability in complex polarization environments.
- In addition to plate-type beamsplitters, cube-type versions are also available upon request.
- High-performance K9 optical glass is used as the substrate, and the ion-assisted hard coating process ensures long-term durability without performance degradation.
70R/30T VIS Non-polarizing Broadband Beamsplitter Technical Datasheet
| Parameter | Specification |
| Wavelength Range | 350–700 nm |
| Reflection / Transmission Ratio | 70% / 30% ± 5% |
| Angle of Incidence (AOI) | 45° ± 1° |
| Substrate Material | K9 |
| Surface Quality | 60-40 40-20 scratch-dig (per MIL-PRF-13830B) |
| Surface Flatness | < λ/2 @633nm |
| Parallelism | < 1 arc minute |
| Clear Aperture | > 90% of central dimension |
| Available Configurations | Plate or Cube |
| Coating Type | Dielectric multilayer non-polarizing beamsplitter coating |
| Other Available Wavelength Bands | 700-1100nm, 900-1700nm |
| Additional Splitting Ratio Options | 20R/80T, 30R/70T, 40R/60T, 50R/50T, 70R/30T, 80R/20T |
| Size Available | 12*17, 25*36, 50*72, Dia12.5*3mm, Dia25*3mm, Dia50*3mm or custom |
| Thickness | 3mm or custom |
70R/30T VIS Non-polarizing Broadband Beamsplitter Applications
- Dual-Beam Spectrometer/Photometer
In quantitative analysis, the light source beam must be precisely split into a sample path (70%) and a reference path (30%). Using ordinary beamsplitters can cause polarization changes induced by the sample to shift the light intensity ratio between the two paths, leading to measurement distortion. The 70R/30T beamsplitter reflects 70% of the light passing through the sample cell to the detector, while 30% is transmitted directly to the reference detector, ensuring a stable reference-to-sample intensity ratio within the visible spectrum. - Real-Time Laser Power Monitoring
Laser polarization states can drift with temperature and time. Polarization-sensitive beamsplitters fail to provide an accurate monitoring signal of the processing path power. The 70R/30T beamsplitter maintains a strict 30% monitoring ratio relative to the main beam power despite polarization fluctuations, ensuring stable high-power laser processing. - Multi-Camera Synchronous Visual Inspection
On industrial production lines, the same object’s light must be split to two cameras. The light source polarization varies due to the object’s surface properties. The 70R/30T beamsplitter reflects 70% of the light to a high-resolution area camera for defect detection, while 30% is transmitted to a high-speed line-scan camera for dimensional measurement, ensuring a constant brightness ratio between the two cameras.
