Product Descriptions
| Characteristics: | 810nm Longpass filter |
| Type: | Interference type |
| Cut-off Wavelength (nm): | 810nm |
| Average Transmittance(%): | >95% |
| Optical Density： | OD2-OD3 |
| Surface Quality: | 60/40 scratch-dig |
| Color: | Silver |
| Shape: | Round or customized. |
| Dimension: | Customized, max. 300x300mm |
| Thickness: | 0.21、0.3、0.55、0.7、1.0、1.1、1.5、1.8、2.0、3.0mm…etc. |
| Substrate: | Ultra-clear glass,K9,BK7,B270,D2637T, Quartz Glass(Fused Silica) or other specified. |
| Remark: Support customized for wavelength from 200-2000nm. | |
Spectral measurement curve
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Picture 1: LP810nm Spectral measurement Curve |
What is typical application for 810nm Longpass Filter?
An 810nm longpass filter is an optical component that allows only infrared light with wavelengths greater than 810nm to pass through, while effectively blocking or reflecting visible light and near-infrared light in the shorter wavelength region. Typical applications of 810nm longpass filters include:
- Night Vision & Security: Shield visible light while transmitting IR, enhancing nighttime imaging with IR LED illumination, and they also used in facial recognition for improved accuracy.
- Beauty & Medical Devices: Filter out harmful UV and visible light in IPL devices, selectively transmitting therapeutic near-IR for safer and more effective treatments.
- Machine Vision & Industrial Inspection: Remove visible stray light to boost IR-band contrast for clearer inspections, and they also used in laser diodes and IR LED systems to reduce noise.
- Scientific Research & Optical Instruments: Separate excitation light from signals in fluorescence microscopy and Raman spectroscopy, and also widely used in spectrometers, stage lighting, and optical instruments.
What is key parameter when choose for right Longpass Filter?
When selecting a Longpass Filter, normally the following factors need to be taken into consideration：
- Cut-Off Wavelength: it is one of the most important parameters, typically defined as the wavelength transmittance at 50% .
- Average or Peak transmittance: usually average transmittance ≥90%, higher transmittance e.g. 92% or 95% on average or specific single point need to definite and communicate with manufacturer, higher transmittance need to additional AR coating.
- Blocking rate: usually expressed in terms of optical density(OD), OD2-OD3 for standard and higher will be OD4-OD6 per requirement
- Angle of Incidence (AOI): AOI need to be consider as Interference Filter is angle sensitive, 0° AOI by default, other AOI e.g. 30/45° need to be specified.
- Physical and environmental requirement: Substrate type, dimensions and thickness, surface quality, and environmental durability.
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 coating layer is firm and has good tightness, and small bandwidth drift. Besides, Liyuan optoelectronics 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.
Remark：Because the interference type filter varies its performance at different angles, the spectral parameters usually determine its appearance color; moreover, the pictures in this link may originate from various shooting angles, so the actual color should therefore rely on the final spectral parameters required as the standard.
