1.Product Descriptions:
| Characteristics: | 650nm Bandpass Filter |
| Type: | Bandpass Filter |
| Central Wavelength (CWL): | 650+-5nm |
| Full Width at Half Maximum(FWHM): | 10/20/40/45/60/80/100/300nm |
| Peak Transmittance(%) : | >90% |
| Cut-off depth: | OD2-OD3 |
| Shape: | Square, Round, Irregular Shape |
| Color: | Red |
| Surface Quality: | 60/40 scratch-dig or specified |
| 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 |
2.Measured Spectral Graph – 650nm Bandpass filter:
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| Picture 1: BP650-40nm Spectral Graph measurement |
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| Picture 2: BP650-45nm Spectral Graph measurement |
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| Picture 3: BP650-60nm Spectral Graph measurement |
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| Picture 4: BP650-100nm Spectral Graph measurement |
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| Picture 5: BP650-300nm Spectral Graph measurement |
3.What is typical application for 650nm bandpass filters?
650nm bandpass filters are optical devices designed to transmit light primarily at a 650nm wavelength while blocking light at all other wavelengths. Typical application for 650nm bandpass filters are in fluorescence microscopy and flow cytometry. They are also essential in laser-based pointers, barcode scanners, and optical sensing systems, ensuring precise wavelength selection while blocking unwanted background light for enhanced signal-to-noise performance.
4.What are key parameters when choose for a suitable Bandpass Filters?
When selecting a Narrow Bandpass Filter, normally the following factors need to be taken into consideration：
- Central Wavelength (CWL)：CWL is one of key parameter to designate first, it refer to the central wavelength at stable high transmission rate passband.
- Peak or Average Transmittance: typically ≥90%, Higher transmittance might need Anti-reflective(AR) coating.
- Full width at half maximum (FWHM): FWHM refer to the interval between the two wavelength points where the transmittance rate reaches 50%.
- Blocking rate: usually 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 considered 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 coating 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. 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.
