Product Descriptions：
| Product Name: | AR coated HWB760 NIR Black Glass |
| Type: | Dielectric coating on Color Filter Glass |
| Cut-off Wavelength (CWL): | 760nm |
| Average transmittance: | >92% |
| Optical Density (OD): | OD 2 |
| Shape: | Rectangle |
| Angle of Incidence (AOI): | Not Applicable |
| Surface Quality: | 60/40 scratch-dig |
| Dimension (mm): | 14.5×7.5mm |
| Thickness (mm): | 1.0mm |
| Substrate: | HWB760 Infrared Glass(black glass) |
| Remark:Optional Infrared Glass types: HWB760, HWB780, HWB800, HWB830,HWB850,HWB900,HWB930. | |
What are the function of dielectric coating on near-infrared transmitting black glass?
Manufacturers produce dielectric-coated near-infrared transmitting black glass by depositing optical coatings onto a colored glass substrate. This process combines the light-absorbing properties of black glass with the optical performance of specialized coatings.
- In terms of optical performance, this filter retains the light-absorbing characteristics of colored glass. It provides extremely low transmittance in the visible light range of 400–700 nm, effectively blocking visible light from reaching the sensors and electronic devices behind the filter.
- At the same time, the filter maintains high transmittance at specific near-infrared wavelengths, such as 905 nm and 950 nm, which LiDAR systems commonly use. Its typical transmittance can exceed 90%. Adding an anti-reflection (AR) coating can further increase transmittance to 92–95%. This coating reduces reflection losses at the target wavelengths, allowing more infrared signals to pass through the filter with minimal loss.
Thanks to these optical properties, manufacturers widely use dielectric-coated near-infrared transmitting black glass in LiDAR windows, infrared sensing systems, and imaging equipment. It acts as an essential optical window filter, blocking unwanted ambient light while improving the signal-to-noise ratio (SNR) of optical systems.
Related products:
HWB Black Glass with Narrow Bandpass Coating, Coated NIR Transmitting Glass
Shenzhen Hengda Liyuan Optoelectronics introduced advanced optical vacuum technology that apply depositing nano-materials through ion-assisted evaporation onto a multilayer hard film in a high vacuum environment, which the coating layer is firm and has good tightness and small bandwidth drift. The company have been focus on optical coating for more than 17 years ,and the company offer one-stop optical filters solution including Narrow Bandpass Filters, IR cut-off Filters, Longpass Filters, Shortpass Filters, Notch Filters, ND filters, Star filters and Optical sapphire block.
