Laser Ranging Filters are precision bandpass filters engineered for laser distance measurement, LiDAR, and optical ranging systems. These filters selectively transmit the operating laser wavelength while effectively blocking background radiation, significantly improving signal-to-noise ratio (SNR) and ranging accuracy.
Designed to support common ranging wavelengths from the visible to near-infrared, SOT’s filters are widely used in autonomous vehicles, industrial metrology, geophysical surveying, environmental monitoring, defense, and aerospace systems. Advanced coating technology ensures high optical clarity, excellent durability, and stable performance even in harsh outdoor or industrial environments.
Key Features
- Optimized for Laser Ranging & LiDAR – Designed for high-precision distance measurement and optical ranging systems
- Wide Wavelength Compatibility – Standard options at 520, 635, 650, 808, 905, and 940 nm
- High Transmission Efficiency – Tave ≥ 90% to maximize received signal strength
- Strong Out-of-Band Blocking – OD ≥ 3 to suppress ambient light and noise
- Durable Hard Coatings – Scratch-resistant, environmentally stable coatings for long-term reliability
- Fully Customizable – CWL, FWHM, OD, size, and substrate tailored to your system
Spectrum Transmission
Standard transmission curves are optimized for narrow laser lines used in ranging and LiDAR systems, delivering high in-band transmission with steep spectral edges.
If standard models do not meet your requirements, custom transmission curves can be developed based on your laser wavelength, detector sensitivity, and ambient light conditions.
Coating Quality & Environmental Reliability
All laser ranging filters undergo rigorous qualification:
- Adhesion (MIL-C-675C) – No blistering or peeling after repeated tape removal
- Thermal Cycling – −62 °C to +71 °C with no coating detachment
- Abrasion Resistance (MIL-C-675C / CCC-C-440) – No surface damage after 25 cycles at 1.0 lb load
- Humidity Resistance – 95–100% RH at 49 °C for 24 hours without defects
- Solvent Resistance – Stable after acetone and alcohol exposure
- Salt Spray Test – 100 hours at 35 °C, 5% salt concentration with no degradation
Standard Specifications
| Model | CWL (nm) | Transmittance | FWHM (nm) | Optical Density | Notes |
|---|---|---|---|---|---|
| NH-BP520 | 520 ± 5 | Tave ≥ 90% | 30–60 | OD ≥ 3 @ 350–1100 | Customizable |
| NH-BP635 | 635 ± 5 | Tave ≥ 90% | 30–80 | OD ≥ 3 @ 350–1100 | Customizable |
| NH-BP650 | 650 ± 5 | Tave ≥ 90% | 30–120 | OD ≥ 3 @ 350–1100 | Customizable |
| NH-BP808 | 808 ± 5 | Tave ≥ 90% | 30–60 | OD ≥ 3 @ 350–1100 | Customizable |
| NH-BP905 | 905 ± 5 | Tave ≥ 90% | 30–120 | OD ≥ 3 @ 350–1100 | Customizable |
| NH-BP940 | 940 ± 5 | Tave ≥ 90% | 50 ± 3 | OD ≥ 3 @ 350–1100 | Customizable |
Typical Applications
- LiDAR Systems – Autonomous vehicles, robotics, and intelligent transportation
- Geophysical Surveying – Terrain mapping and environmental analysis
- Industrial Metrology – Distance measurement, alignment, and inspection
- Environmental Monitoring – Vegetation analysis, pollution tracking, forestry LiDAR
- Defense & Security – Surveillance, target detection, and reconnaissance
- Aerospace – Navigation, altitude measurement, and ranging systems
Need a custom laser ranging filter?
Contact us with your laser wavelength, detector type, bandwidth requirement, OD target, and operating environment for a tailored solution.