Product Descriptions:
| Characteristics: | 735nm Bandpass Filter |
| Type: | Interference type Filter |
| Central Wavelength (CWL): | 735+-5nm |
| Full Width at Half Maximum(FWHM): | 40nm |
| Peak Transmittance(%) : | ≥92% |
| Cut-off depth: | OD2 |
| Shape: | Round, Square or customized. |
| Color: | Dark Red |
| Surface Quality: | 60/40 scratch-dig |
| Dimension(mm): | Common for 86x86mm, 80x80mm, other can 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: | Ultra-clear glass,K9,BK7,B270,D2637T, Quartz Glass(Fused Silica) or other specified. |
| Remark: Support customized for wavelength from 200-2000nm. | |
Measured Spectral Graph – 735nm Bandpass filter:
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| Picture 1: BP735-40nm Spectral Graph measurement |
What is typical application for 735nm Bandpass Filters?
A 735nm bandpass filter is an optical filter with a center wavelength of 735nm that allows light within a specific wavelength range to pass through while blocking light outside that range.
735nm bandpass filters find wide application in day/night surveillance cameras, intelligent traffic systems, and license plate recognition, where they enable color imaging in daylight and clear NIR illumination at night. They also play a key role in NDVI vegetation monitoring and fluorescence microscopy, detecting specific signals such as BPD photosensitizers.
What are key parameters when choose for a suitable Bandpass Filter?
When selecting a Bandpass Filter, normally the following factors need to be taken into consideration：
- Central Wavelength (CWL)：Firstly,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%, and 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.
Red products:
730nm Bandpass Filter, 730nm CWL, 40nm FWHM, 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.
