1.Product Descriptions：
| Characteristics: | IR650 filter, 650nm infrared cut-off filter |
| Type: | Interference type |
| Cut-off Wavelength(in mm): | 650nm |
| Average Transmittance(%) : | >90% |
| Optical Density (OD): | OD 2 – OD 3 |
| Shape: | Round, Square or Customized |
| Color: | Blue |
| Surface Quality: | 60/40 |
| Dimension(mm): | Customized, max. 300x300mm |
| Thickness(mm): | 0.21、0.3、0.55、0.7、1.0、1.1、1.5、1.8、2.0、3.0mm…etc. |
| Substrate materials: | Ultra-clear glass,BK7,B270,D2637T, ,K9,Quartz Glass(Fused Silica) or other specified optical glass |
| Remark: | |
2.Measured Spectral measurement
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Picture 1: IR650nm Spectral measurement examples |
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Picture 2: IR650nm + AR Spectral measurement examples |
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Picture 1: Blue Glass Substrate IR650nm Spectral measurement examples |
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Picture 1: UV+IR650nm Spectral measurement examples |
3.What is IR650 cut-off filter?
An IR650 cut-off filter is a type of short-pass filter that transmits visible light while blocking near-infrared light. The 650 typically refers to its cut-off wavelength, which in optical terms is usually defined as the point where transmittance drops to 50%. For an IR650 cut-off filter, visible light with wavelengths shorter than 650nm passes through efficiently in the transmission band, while infrared light with wavelengths longer than 650nm is strongly blocked in the cut-off band.
4.What is typical application for IR650 cut-off filter?
When selecting an IR650 cut-off filter, you need to consider multiple dimensions such as application scenarios, spectral performance indicators, physical characteristics, environmental reliability, and cost. Typically, the visible light transmittance should be ≥90%, reaching 95% after coating, the infrared blocking depth should be OD≥3, and the narrower the transition band, the better. You should choose between absorption-type or reflection-type filters based on different application scenarios. At the same time, you also need to consider the effects of size and incidence angle, as the cutoff wavelength of interference filters will shift toward shorter wavelengths at large angles of incidence.
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 IR cut-off filters in stock from Liyuan Optoelectronics: IR600 IR630 IR650 IR680 IR700 IR730 IR750…etc.
