Product Descriptions
| Characteristics: | 1020nm Longpass filter |
| Type: | Reflective type interference filter |
| Cut-off Wavelength (nm): | 1020nm |
| Average Transmittance(%): | >92% |
| 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 graph
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Picture 1: LP1020nm spectral measurement |
What is typical application for 1020nm Longpass Filter?
An 1020nm infrared longpass filter is an optical component that allows only infrared light with wavelengths greater than 1020nm to pass through, while effectively blocking or reflecting visible light and near-infrared light in the shorter wavelength region.
Typical applications of 1020nm longpass filters include:
- Analytical & Testing Instruments: Used in chemical, environmental, elemental analysis, spectrometers, and life sciences for separating and measuring specific wavelength signals.
- Imaging & Machine Vision: Applied in imaging systems, machine vision inspection, and CCD filtering to remove stray light and enhance contrast in specific bands.
- Optical Systems & Research: Used in fluorescence microscopes, laser systems, projectors, light box sources, and stage lighting.
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.
Related products:
945nm Longpass Filter,LP945nm Long-wavelength pass filter for facial recognition, machine vision, and fluorescence spectroscopy
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.
