1.Product Descriptions:
| Characteristics: | 645 & 800nm Dual Bandpass Filter |
| Type: | Interference Type Filter |
| Central Wavelength(in nm): | 645nm, 800nm |
| Peak Transmittance(%) : | >92% |
| Full Width at Half Maximum(FWHM): | 35nm |
| Optical Density (OD): | OD2 – OD3 |
| Shape: | Round, Square or customized. |
| Color: | Red |
| Angle of Incidence(AOI): | 0° |
| Surface Quality: | 60/40 scratch-dig |
| 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,K9,BK7,B270,D2637T, Quartz Glass(Fused Silica) or other specified. |
| Remark: Support customized for wavelength from 200-2000nm. | |
2.Measured Spectral Graph – 645 & 800nm Dual Bandpass filter:
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| Picture 1: 645 & 800nm Dual Bandpass Filters Spectral Graph measurement |
3.What is the difference between a Dual bandpass filter and a standard (single) bandpass filter?
The main difference between a dual bandpass filter and a standard bandpass filter is that a standard bandpass filter focuses on a single specific spectral passband, while a dual bandpass filter integrates two spectral channels into a single optical component.
4.What is typical application for 640 & 800nm Dual Bandpass Filters?
A 645 & 800nm Dual Bandpass Filter functions as an optical filter that transmits light at two distinct wavelength passbands, it centers at approximately 645nm red light and 800nm near infrared light while effectively blocking all other wavelengths across its specified range. Typical applications of the 640 & 800nm Dual Bandpass Filter span a very broad range, it is used in fluorescence microscopy and flow cytometry for simultaneous multi-color imaging of different near-infrared fluorophores. Besides, it is also essential in machine vision for industrial inspection and in multi-spectral sensors for remote sensing.
5.What is key parameter when choose for suitable a Dual Bandpass Filter?
When selecting a Dual Bandpass Filter, normally the following factors need to be taken into consideration：
- Central Wavelength (CWL)：Firstly, CWL is one of key parameter to designate, 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): it 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:
650&850nm Dual Bandpass Filter, 40nm FWHM,Day&Night Optical Filter
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