Product Descriptions:
| Characteristics: | 750nm Longpass Filter |
| Type: | Reflective type interference filter |
| Cut-off Wavelength: | 750nm |
| Average Transmittance(%) : | >92% |
| Optical Density (OD): | OD2 |
| Shape: | Round, Square or customized |
| Color: | Silver |
| Surface Quality: | 60/40 scratch-dig |
| Dimension(mm): | Customized* |
| Thickness(mm): | Customized** |
| Substrate: | Optical Glass *** |
Remark：Spectral range:350-1100nm *Size customized: 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. *** Available for: Ultra-clear glass,K9,BK7,B270,D2637T, Quartz Glass(Fused Silica) or other specified material. | |
Spectral measurement graph
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Picture 1: LP750nm Spectral measurement graph |
What are typical applications for 750nm Longpass Filter?
A 750nm longpass filter is an optical component that transmits only near-infrared light with wavelengths longer than 750nm, while blocking visible light below 750nm.
The 750nm longpass filters are widely employed in fluorescence microscopy, Raman spectroscopy, infrared imaging, IPL beauty devices, and biometric recognition. In these applications, they effectively block visible light interference while selectively transmitting near-infrared signals, thereby significantly improving imaging quality, detection accuracy, and treatment safety.
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:
760nm Longpass Filter for beauty apparatus,760-1200nm or 760-1800nm Long wavelengths pass, OD2, Support customized
900-1800nm Longpass Filter,LP900-1800nm Long-wavelength pass Filter, Support customized
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.
