Product Descriptions:
| Characteristics: | 420nm Bandpass Filter |
| Type: | Interference type |
| Central Wavelength (CWL): | 420+-5nm |
| Full Width at Half Maximum(FWHM): | 40nm |
| Peak Transmittance(%) : | >80% |
| Surface Quality: | 60/40 scratch-dig |
| Optical Density (OD): | OD2-OD3 |
| Color: | Blue |
| 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:200-1200nm
*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. |
Measured Spectral Graph – 420nm bandpass filters:
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| Picture 1: BP420-40nm Spectral Graph |
What is typical application for 420nm Bandpass Filter?
A 420nm bandpass filter is an optical interference filter that transmits only a narrow spectral band centered around 420nm while blocking all other wavelengths of light. The 420nm Bandpass Filter finds broad applications across multiple fields:
- Analytical Instruments and Clinical Chemistry: Used in clinical chemistry analyzers, colorimetry, and environmental testing instruments to isolate the pure 420nm band from complex optical signals for quantitative analysis.
- Life Sciences and Fluorescence Detection: Employed in fluorescence analyzers, microplate readers, and other equipment as key components for exciting or detecting the signals of specific fluorescent dyes.
- Laser Spectroscopy and Elemental Analysis: Applied to isolate and extract the spectral lines of specific lasers, and also utilized in atomic spectroscopy and related fields.
- Industrial and Specialized Imaging: Used in machine vision, biometric identification, and multi-band detection systems to eliminate interfering light and obtain high-contrast images.
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:
NBP400-20nm Narrow Bandpass Filter, 400nm CWL, 20nm FWHM, Optical Filter for medical devices, microscopy, machine vision & laser systems
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.
