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443/15nm Narrow Bandpass Optical Filter
443/15nm Narrow Bandpass Optical Filter Coligh manufactures is designed to transmit light centered at 443 nanometers with a narrow bandwidth of 15nm
It has features below:
- 443nm center wavelength
- 15nm FWHM
- High Transmission > 90%
- Deep blocking depth OD>=6
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443nm 15nm FWHM Optical Interference Filter Descrption
443/15nm narrowband bandpass filter is an optical filter designed for precise spectral separation. It can selectively transmit narrowband optical signals near 443nm while strictly suppressing out-of-band interference light
- Central wavelength 443nm, deviation controlled within ±1nm, ensuring accurate matching of target wavelength.
- Bandwidth 15nm, tolerance +/-1nm, narrow transmission window, only allows 443nm±7.5nm light to pass through, effectively filtering out excitation light and ambient stray light, excellent spectral selectivity
- The transmittance in the passband is greater than or equal to 90%, maximizing the utilization of optical signals, and outside the passband 3500-1000nm, the cutoff depth OD>=6 significantly improves the signal-to-noise ratio of the target signal
- We use fused quartz as the substrate, with low thermal expansion coefficient and adaptable to wide temperature environments.
- We use ion-assisted deposition (IAD) technology, with strong film adhesion, adaptable to harsh industrial and outdoor environments.
443/15nm Narrow Bandpass Optical Filter Technical Datasheet
| Parameter | Specification |
| Center Wavelength (CWL) | 443 nm ± 1 nm |
| Full Width at Half Maximum (FWHM) | 15nm± 1 nm |
| Peak Transmission | 90% |
| Blocking Range | 350-1000nm |
| Optical Density (OD) | OD ≥ 6 outside passband |
| Angle of Incidence (AOI) | 0° +/-5° |
| Surface Quality | 60/40 scratch-dig (per MIL-PRF-13830B) |
| Material Substrate | Fused Silica JGS1 |
| Coating Type | Hard-Coated Interference Filter/ IAD Assisted Coating |
| Thickness | 1mm (typical) |
| Filter Dimensions | Custom sizes available (e.g., Ø12.5 mm, 60×60 mm) |
| Clear Aperture | >90% of physical size |
| Operating Temperature | -40°C to +85°C |
443/15nm Narrow Bandpass Optical Filter Applications
- Flow cytometry
Flow cytometry detects cell surface proteins or nucleic acids through FITC and Alexa Fluor 430, but multiple fluorescent dye signals in the sample are prone to cross-interference, and weak signals are easily covered by the background noise of the excitation light 488nm laser. The 443/15nm bandpass filter can integrate the filter into the fluorescence detection channel of the flow cytometer, allowing only the target dye emission light 435-455nm to pass, strictly blocking the excitation light 488nm or other dye signals, and accurately separating the signals - Cyanobacteria chlorophyll a fluorescence detection
The chlorophyll a of cyanobacteria blooms has a characteristic fluorescence peak at 440-450nm, but the wide-spectrum fluorescence of dissolved organic matter in the water body will interfere with the detection, resulting in deviations in the estimation of algae concentration. The 443/15nm optical filter can be embedded in the fluorescence detection module of the online water quality monitor, with a 430-450nm excitation light source, only transmitting chlorophyll a emission light of 443nm±7.5nm, and filtering out the 500-600nm background fluorescence of CDOM. - Laser Induced Breakdown Spectroscopy (LIBS) System
LIBS detects material composition by analyzing plasma emission spectra, such as Cr and Fe spectra in metals, but there is interference from ambient light near 443nm, which affects the detection limit of trace elements. This green light Pina can be placed in the front optical path, transmitting only the characteristic spectra of target elements such as Cr 440.85nm and Fe 441.51nm, filtering out sunlight and continuous background radiation from laser plasma.
