Laser Radar Filters are high-performance bandpass filters engineered specifically for LiDAR and laser ranging systems. These filters precisely transmit the target laser wavelength while effectively blocking background light, ambient noise, and unwanted spectral components.
LiDAR systems used in autonomous vehicles, geophysical surveying, industrial automation, defense, and aerospace depend on tight spectral control to achieve accurate time-of-flight measurements and high-resolution 3D mapping. SOT’s laser radar filters employ advanced multilayer dielectric coatings to deliver high average transmittance (≥90%), strong optical density, and long-term stability.
Key Features
- Precision Performance for LiDAR – Optimized to enhance signal-to-noise ratio and ranging accuracy in laser radar systems
- Advanced Optical Coatings – High transmittance with strong out-of-band suppression for clean signal detection
- Wide Wavelength Coverage – Designed for 850 nm, 905 nm, 940 nm, and 1550 nm LiDAR platforms
- Customizable Designs – CWL, FWHM, optical density, AOI, and size can be tailored to your system
- Durable & Reliable – Qualified for harsh outdoor, automotive, and industrial environments
Spectral Performance
Each filter is designed with a dedicated bandpass profile matched to common LiDAR emitters.
Custom spectrum transmission curves are available upon request for non-standard wavelengths or bandwidths.
Coating Parameters
| Parameter | Value |
|---|---|
| Transmittance | T ≥ 90%, T ≥ 95% (Customization available upon request) |
| Center Wavelength (CWL) | Typical wavelengths: 850 nm, 905 nm, 940 nm, 1535 nm, 1550 nm (selection based on customer’s requirements) |
| Bandwidth (FWHM) | 10–60 nm (selection based on customer’s requirements) |
| Optical Density (OD) | OD ≥ 3, OD ≥ 4 (customizable) |
| Dimension | Process as per customer’s requirements |
| Thickness | Convention: 0.55 mm, 1.0 mm, 1.1 mm, 2.0 mm, 3.0 mm (customizable) |
| Note | Conductive films can be coated, and the sheet resistance can be customized |
Common LiDAR Filters
| Model | Center Wavelength (nm) | Peak Transmittance | Bandwidth (FWHM, nm) | Optical Density (OD) | Incidence Angle (°) |
|---|---|---|---|---|---|
| BP850/10 | 850 ±2 | T ≥ 90% | 10 ± 2 | OD ≥ 3 @ 300–1100 | 0 |
| BP850/30 | 850 ±3 | T ≥ 90% | 30 ± 3 | OD ≥ 3 @ 300–1100 | 0 |
| BP850/50 | 850 ±5 | T ≥ 90% | 50 ± 3 | OD ≥ 3 @ 300–1100 | 0 |
| BP905/10 | 905 ±2 | T ≥ 90% | 10 ± 2 | OD ≥ 3 @ 300–1100 | 0 |
| BP905/30 | 905 ±3 | T ≥ 90% | 30 ± 3 | OD ≥ 3 @ 300–1100 | 0 |
| BP905/50 | 905 ±5 | T ≥ 90% | 50 ± 3 | OD ≥ 3 @ 300–1100 | 0 |
| BP940/10 | 940 ±2 | T ≥ 90% | 10 ± 2 | OD ≥ 3 @ 300–1100 | 0 |
| BP940/30 | 940 ±3 | T ≥ 90% | 30 ± 3 | OD ≥ 3 @ 300–1100 | 0 |
| BP940/50 | 940 ±5 | T ≥ 90% | 50 ± 3 | OD ≥ 3 @ 300–1100 | 0 |
| BP1550/10 | 1550 ±2 | T ≥ 90% | 10 ± 2 | OD ≥ 4 @ 600–2000 | 0 |
| BP1550/30 | 1550 ±3 | T ≥ 90% | 30 ± 3 | OD ≥ 4 @ 600–2000 | 0 |
Applications
- Autonomous Vehicles & ADAS – Accurate object detection and ranging in automotive LiDAR
- Geophysical & Terrain Surveying – High-precision mapping and vegetation analysis
- Industrial Automation – Non-contact measurement, inspection, and sorting systems
- Defense & Security – Surveillance, target tracking, and reconnaissance LiDAR
- Environmental Monitoring – Forest density, air quality, and atmospheric analysis
- Aerospace – Altitude measurement and navigation laser radar systems
Need a custom LiDAR filter?
Share your wavelength, bandwidth, AOI, size, and environmental requirements—we’ll engineer the optimal laser radar filter for your system.