940nm 10nm FWHM Ultra-Narrowband IR Filter | Ultra-Narrowband Filter Manufacturer
Coligh customs and manufactures 940nm 10nm Ultra-Narrowband IR Filter. As Narrow Spectral Bandpass Filter, we custom and OEm NIR thin film filter.
940nm 10nm FWHM Ultra-Narrowband IR Filter Overview
The 940nm 10nm FWHM Ultra-Narrowband IR Filter is an ultra-narrowband infrared filter with a center wavelength of 940nm, a half-bandwidth of 10nm, and a passband range of 935-945nm with a transmittance greater than 90%. Specifically designed for complex lighting environments, it filters sunlight background noise and other stray light with its ultra-narrow 10nm bandwidth and steep edge transition, extracting target signals at 940nm. It is commonly used in 3D sensing, ToF cameras, gas sensing, Raman spectroscopy, laser ranging, biometrics, and fluorescence detection applications.
Coligh, as a manufacturer of ultra-narrowband infrared filters, employs advanced ion-assisted deposition hard oxide coating technology to strictly control the tolerance of the center wavelength and bandwidth within +/-2nm, while ensuring an out-of-band cutoff depth of OD4-OD6 or higher. We provide customers with a complete production process from film system design and coating to testing.
940nm 10nm FWHM Ultra-Narrowband IR Filter Product Features
- With an ultra-narrow bandwidth of 10nm while maintaining over 90% transmittance, the strength and purity of the 940nm signal are guaranteed.
- Stray light from the ultraviolet to near-infrared range can be suppressed within the cutoff depth range of OD4-OD6, improving the signal-to-noise ratio.
- We employ IAD hard coating and utilize precise wavelength control and temperature drift resistance design to ensure the stability of the center wavelength and bandwidth.
940nm 10nm FWHM Ultra-Narrowband IR Filter Spectrum
Steep Edge Narrow Bandpass Filter 940nm/10nm Specification
- CWL：940+/-2nm
- FWHM: 10+/-2nm
- Tp>=95%
- Blocking: 200-1100nm@OD6
Coligh Customize Capability Of Hard-Coated IAD NIR Filter
As a professional optical filter factory and supplier, we have a complete set of independent production lines from substrate processing to coating, which can optimize and adjust the size, shape and angle. In addition, each batch of products undergoes high-precision spectrophotometric testing before leaving the factory. We can support sampling, small batch, large batch and OEM/ODM.
| Parameter | Customization Options |
|---|---|
| Center Wavelength (CWL) | 160–20,000 nm |
| FWHM (Bandwidth) | 0.5–200 nm |
| Shape / Dimensions | Round, square, and custom geometries |
| Thickness | 0.21, 0.30, 0.50, 0.55, 0.70, 1.0, 1.1, 1.5, and 2.0 mm |
| Peak Transmittance (Tpeak) | Optimized according to application requirements |
| Blocking / Optical Density (OD) | OD2–OD6+, customizable |
| Substrate Materials | Optical glass, fused silica, B270, sapphire |
| Angle of Incidence (AOI) | 0–60° |
| Laser Damage Threshold (LIDT) | Optimized according to application and laser-power requirements |
940nm High-Precision Narrowband Filter Applications
3D Sensing and ToF Cameras
When 3D sensing and ToF modules operate outdoors or in strong ambient light, sunlight, incandescent light, and other infrared light sources enter the detector in large quantities. Ultra-narrow band filters (940/10nm) allow only a very narrow band of the 940 nm VCSEL to pass through, blocking other background light and improving signal-to-noise ratio and resolution.
LiDAR and Near-Infrared Ranging
When 940 nm LiDAR and near-infrared ranging systems operate outdoors, the detector receives sunlight, ambient infrared light, and long-wave background light, reducing ranging accuracy and detection range. Ultra-narrow band filters allow only the 940 nm echo to pass through, suppressing background light, improving signal-to-noise ratio, and increasing detection range.
Infrared Laser Diode System
When an infrared laser diode is operating, in addition to the dominant wavelength, it also generates some extraneous stray light, affecting the system’s purity. A 940/10nm ultra-narrowband filter can be used as a cleaner at the laser emitter, enabling the system to obtain high-purity spectral output and eliminating crosstalk.
