Skip to content 
532/1240nm Dual Notch Filter
532/1240nm Dual Notch Filter is able to suppress both 532nm and 1240nm while allowing other wavelengths. Coligh manufactures high precision single wavelength and multi-wavelength negative filters.
- A depression is formed at 532nm and 1240nm at the same time to suppress these two wavelengths.
- Multi-layer dielectric film deposition is used to efficiently transmit 1064nm, 1120nm, 1178nm, 1400-1500nm.
- Large incident angle of 38°
Products Categories
Get A Free Quote
532/1240nm Dual Notch Filter Description
Notch filter is also called a bandstop or negative filter. 532/1240nm Dual Notch Filter is a special filter that can block the passage of 532nm and 1240nm wavelengths at the same time to avoid cross-interference in multi-light source scenarios.
- At the same time, it allows other wavelengths of light to pass efficiently (such as 1064nm, 1120nm, 1178nm and 1400-1500nm), retaining effective signals to the maximum extent.
- We use the ion-assisted deposition (IAD) process through the interference effect of multi-layer dielectric films.
- The film has high hardness and strong adhesion, stable performance within the range of incident angle 0-38°, and is suitable for a variety of optical systems.
532/1240nm Dual Negative Filter Technical Datasheet
| Parameter | Specification |
| Filter type | band stop filter |
| Suppressed Wavelengths | 532 nm, 1240 nm |
| Suppression Depth | R>99% |
| High Transmission Bands | 1064 nm, 1120 nm, 1178 nm, 1400-1500 nm |
| Transmission Efficiency | ≥ 98% (at target bands) |
| Incident Angle | 38° |
| Substrate Material | Quartz or fused silica |
| Surface Quality | 80/50 60/40 40/20 (scratch/dig, per MIL-PRF-13830B standard) |
| Dimensional Tolerance | ± 0.1 mm |
| Thickness Tolerance | ± 0.05 mm |
| Chamfer | 0.2 mm × 45° |
| Coating Method | Multilayer ion beam sputtering (IBS) or electron beam evaporation |
| Custom | Single wavelength notch filter, triple band notch filter |
532/1240nm Dual Negative Filter Technical Applications
532/1240nm Dual Negative Filter is used in multiple scenarios:
- Laser Lidar
In laser communication, this filter has high transmittance in specific communication bands (such as 1064 nm) or target bands (1178 nm and 1400-1500 nm) and suppresses interference bands to improve the accuracy of laser detection and ranging - Medical imaging
In medical device imaging, it transmits in the 1400-1500 nm band and suppresses other wavelengths to reduce interference. It can be used for skin, ophthalmology or tissue heating treatment, while suppressing non-therapeutic wavelengths to prevent tissue damage. - Laser protection
In the field of laser protection, such as laser goggles, this filter can suppress 532 nm and 1240 nm wavelengths (such as green light and infrared lasers) to prevent damage to the human eye, while maintaining the perspective of other wavelengths.
