1.Product Descriptions:
| Characteristics: | 680nm Bandpass Filter |
| Type: | Interference type |
| Central Wavelength (CWL): | 680+-5nm |
| Full Width at Half Maximum(FWHM): | 40nm |
| Peak Transmittance(%) : | >95% |
| Surface Quality: | 60/40 scratch-dig |
| Optical Density (OD): | OD2-OD3 |
| Color: | Dark red |
| Shape： | Square, Round, Irregular Shape |
| 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
*** Thickness available: 0.21、0.3、0.55、0.7、1.0、1.1、1.5、1.8、2.0、3.0mm…etc. |
2.Measured Spectral Graph – 680nm Bandpass filter:
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| Picture 1: BP680-40nm Spectral Graph measurement |
3.What is typical application for 680nm bandpass filters?
A 680nm bandpass filter is a precision optical element that only allows light centered at 680nm to pass, while blocking all other spectral bands. Typical application for 680nm bandpass filters are very broad, including red laser systems and optical signal processing, plant photosynthesis & agricultural detection, machine vision and color sorting equipment, biomedical testing and spectral instruments, ambient light interference suppression.
4.What are key parameters when choose for a suitable Bandpass Filter?
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.
Related products:
670nm Bandpass Filter, 670nm CWL,25nm FWHM, Hard coated, Unmounted Optical Filter
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 typical Bandpass filters in stock from Liyuan Optoelectronics include BP810 BP820 BP830 BP840 BP850 BP860 BP870 BP880 BP890 BP…etc.
