The OPTOStokes LP750nm is a professional-grade longpass filter that serves as a definitive boundary between the visible world and the Near-Infrared (NIR) spectrum. Visually appearing as opaque black glass to the human eye, this filter is engineered to block the entire visible spectrum up to 750nm, ensuring that only infrared signals reach your detector.
Designed for high-performance optical systems, the LP750nm provides a high-efficiency transmission window from 750nm to 1100nm, with an average throughput greater than 90 percent. By rigorously attenuating ultraviolet and visible light to levels less than 1 percent, it eliminates visual noise and enhances the signal integrity of NIR sensors. The standard 1.0mm thickness offers excellent mechanical rigidity, making it suitable for mounting in industrial lens assemblies and laboratory fixtures.
Technical Specifications
The following table outlines the verified optical and mechanical parameters for SKU 21103958. These specifications are critical for engineers designing systems requiring absolute visible light suppression.
| Parameter | Specification |
|---|---|
| Model | LP750nm Longpass Filter |
| Passband (Transmission) | 750nm - 1100nm (Avg T > 90%) |
| Blocking Range | 350nm - 750nm (Avg T < 1%) |
| Thickness | 1.0mm |
| Surface Quality | 60/40 (Scratch/Dig) |
| SKU | 21103958 |
Typical Applications
Because it blocks all visible light while passing IR, the LP750nm is indispensable for "covert" and precision sensing applications:
- Covert Surveillance: Used in front of CCTV lenses to block visible light, allowing the camera to see only under IR illumination (750nm, 850nm, or 940nm) for discreet night monitoring.
- Iris Recognition & Biometrics: Filters out ambient light interference to capture high-contrast images of the iris using NIR wavelengths.
- Machine Vision: Essential for inspection systems using IR detector arrays, removing the noise caused by factory lighting or sunlight variation.
- Remote Sensing: Used in NDVI analysis (vegetation health) to isolate the near-infrared reflectance of plant life.
Customization & Manufacturing
OPTOStokes provides tailored solutions to fit your specific instrument design. Our custom optical filters service includes:
- Geometry: We can cut and edge the 1.0mm substrate into circles, squares, or custom shapes.
- Mounting: Available as bare glass or pre-mounted in threaded aluminum rings (e.g., M25.5, M27, M30.5).
- Verification: Every production lot is spectrally verified to ensure the cut-on wavelength meets the ± tolerance.
Reliable Optics for Critical Systems
Consistency is key when integrating IR optics.
OPTOStokes maintains a robust inventory of LP750nm materials to ensure short lead times for both prototyping and mass production. We help you move from concept to market faster with reliable, high-quality optical components.
Need technical specifications or a volume quote? Contact our engineering sales team at sales@optofilters.com.
