Product Descriptions:
| Characteristics: | 850nm Bandpass Filter |
| Type: | Bandpass Filter |
| Central Wavelength (CWL): | 850+-5nm |
| Full Width at Half Maximum(FWHM): | 25/40/45/55/60/70/140nm |
| Peak Transmittance(%) : | >92% |
| Cut-off depth: | OD2-OD3 |
| Shape: | Square, Round, Irregular Shape |
| Color: | Black |
| Surface Quality: | 60/40 scratch-dig |
| Dimension(mm): | specified** |
| Thickness(mm): | specified*** |
| Substrate: | Ultra-clear glass,K9,BK7,B270,D2637T, Quartz Glass(Fused Silica) or other specified. |
| Remark: Spectral range:350-1100nm *Customized capability: 380-2500nm, stock for 10nm intervals. **Common for 86x86mm, 80x80mm, other can customized, max. 300x300mm *** Thickness available: 0.21、0.3、0.55、0.7、1.0、1.1、1.5、1.8、2.0、3.0mm, etc. | |
Measured Spectral Graph – 850nm bandpass filter:
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Picture 1: BP850-25nm Spectral Graph measurement |
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Picture 2: BP850-40nm Spectral Graph measurement |
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Picture 3: BP850-45nm Black Glass Substrate Spectral Graph measurement |
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Picture 4: BP850-55nm Spectral Graph measurement |
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Picture 5: BP850-60nm Spectral Graph measurement |
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Picture 6: BP850-60nm +AR Spectral Graph measurement |
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Picture 7: BP850-70nm Spectral Graph measurement |
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Picture 8: BP850-140nm Spectral Graph measurement |
What is typical application for 850nm bandpass filters?
An 850nm bandpass filter is an optical device that selectively transmits light centered at 850nm while blocking wavelengths outside its passband. 850nm bandpass filters find wide use in night vision surveillance, where they isolate IR illuminator light and produce clearer camera images. They also serve in laser diode testing, optical communications, and medical imaging applications such as optical coherence tomography. In industrial inspection, these filters block ambient light, improve contrast, and ensure reliable sensor readings.
What is key parameter when choose for right bandpass filter?
When selecting a bandpass filters, the center wavelength (CWL) will be one of key parameter to be designated, it refer to the wavelength at which the filter achieves maximum transmission. Secondly, Peak and Average Transmittance, typically ≥80–95%, higher transmittance might need Anti-reflective(AR) coating. Third, full width at half maximum (FWHM). Forth, Blocking Range & Depth. Fifth, substrate material, e.g., BK7, B270, fused silica, colored glass. Sixth, surface quality, e.g., 60/40, 40/20. Seventh, Size & Shape, etc.
Shenzhen Hengda Liyuan Optoelectronics introduced advanced optical technology that apply depositing nanomaterials through ion-assisted evaporation onto a multilayer hard film in a high vacuum environment which coating layer is firm and has good tightness, and small bandwidth drift. Liyuan optoelectronics have been focus on optical coating for more than 17 years and offer one-stop optical filters solution including Narrow Bandpass Filters, IR cut-off Filters, Longpass & Short Filters, Notch Filters, ND filters, Star filters and Optical sapphire block.
Other typical Bandpass filters in stock from Liyuan Optoelectronics include BP810 BP820 BP830 BP840 BP850 BP860 BP870 BP880 BP890 BP…etc.
