850nm Bandpass Filters

850nm bandpass filters are designed to transmit a selected near-infrared band centered near 850nm while reducing unwanted out-of-band light.

Applications:
- 850nm NIR LED or VCSEL source cleanup
- Machine vision, night-vision, and NIR camera imaging
- Detector-side 850nm signal isolation before silicon photodiodes, CMOS/CCD cameras, or NIR sensors
- Short-range optical sensing and reflective detection systems
- 850nm multimode fiber, optical communication, and test setups

Bandwidth options:
- 1.2nm and 10nm FWHM for narrow 850nm laser or VCSEL signal isolation
- 20nm, 25nm, and 30nm FWHM for receiver-side filtering and optical sensing
- 40nm, 45nm, 50nm, 70nm, and 100nm FWHM for NIR LED illumination, machine vision, and camera-side signal level

Select the bandwidth based on the LED, VCSEL, or laser spectrum, detector sensitivity, ambient background, blocking range, and required NIR signal level.
850nm Bandpass Filters
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Filters

10 items
Center Wavelength (nm)
FWHM (nm)
Optical Density(OD)

Filter

Center Wavelength (nm)
FWHM (nm)
Optical Density(OD)

Selection Guide

850nm NIR LED or LED array

Use CWL 850nm with 40–100nm FWHM for NIR LED illumination, machine vision, night-vision imaging, or camera-based inspection.

850nm LEDs have broader emission than laser or VCSEL sources. Wider filters help keep usable NIR illumination for cameras while reducing visible light and unwanted spectral background. Use 40–50nm FWHM for more controlled NIR illumination, or 70–100nm FWHM when image brightness is the main requirement.

850nm VCSEL or laser diode

Use CWL 850nm with 1.2–10nm FWHM for 850nm VCSEL or laser diode signal isolation.

850nm VCSELs and laser diodes are narrow sources compared with LEDs. For source cleanup or receiver-side isolation, key specs include CWL match, FWHM, transmission at 850nm, and OD blocking across the detector-sensitive wavelength range.

Machine vision and NIR camera imaging

Use CWL 850nm with 40–100nm FWHM for NIR machine vision, surveillance imaging, alignment, or contrast enhancement.

For CMOS and CCD camera systems, 850nm filters can help isolate the NIR illumination band and reduce visible-light background. Wider FWHM options are often practical when the task depends on image brightness, contrast, and stable camera response.

Detector-side 850nm signal isolation

Use CWL 850nm with 10–30nm FWHM before a silicon photodiode, CMOS/CCD camera, or NIR-sensitive detector when the target signal is near 850nm.

For detector-side filtering, the filter improves signal-to-background ratio by passing the 850nm signal and reducing unwanted ambient or source background. Use 10nm FWHM for stronger 850nm isolation, or 20–30nm FWHM when more signal level is needed.

Application Note

US10574911B2 - Multispectral imaging apparatus

US10574911B2 - Multispectral imaging apparatus

Context: A multispectral camera system designed for Unmanned Aerial Vehicles (UAVs/Drones), primarily used in precision agriculture to monitor crop health.

Usage of Filter: The 850nm bandpass filter is integrated into one of the four distinct optical paths (lenses) of the camera array.

Function: It strictly isolates the Near-Infrared (NIR) wavelength band (centered at 850nm) from the incoming sunlight reflected by the plants, blocking visible light frequencies (Red, Green, Blue).

Result: By capturing a pure 850nm image and comparing it with a separate Red (e.g., 660nm) image, the system can calculate the Normalized Difference Vegetation Index (NDVI). This allows farmers to determine the chlorophyll content and stress levels of crops invisible to the naked eye.

US10928485B2 - Lidar ring lens return filtering

US10928485B2 - Lidar ring lens return filtering

Context: A LiDAR (Light Detection and Ranging) sensor assembly used for autonomous vehicle navigation and mapping.

Usage of Filter: The bandpass filter is located in the "return path" of the optical system, situated between the receiving lens (specifically a ring lens design) and the avalanche photodiode detector.

Function: It serves to "clean" the incoming signal. It permits the passage of the specific laser wavelength (in this case, matching an 850nm emitter) reflected off objects, while filtering out solar background radiation and stray light scattering.

Result: This ensures the precise timing of the laser pulse's return (Time-of-Flight measurement), resulting in accurate distance calculation and high-fidelity point cloud generation without "ghost" points caused by light interference.

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