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405nm Filter FWHM 12nm Narrow Bandpass Interference Filter
405nm Filter FWHM 12nm Narrow Bandpass Interference Filter is designed to transmit light centered 405nm and FWHM 12nm. Coligh manufactures high precision bandpass filter.
It has features below:
- Center wavelength 405nm
- FWHM 12nm
- Transmission above 90%
- Blocking depth OD>=6
- ION Assisted Hard Coating
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High Precision 405nm Optical Filter with 12nm Bandwidth Description
405nm Filter FWHM 12nm Narrow Bandpass Interference Filter Coligh manufactures is a high-performance optical filter based on precision thin film interference technology.
- We use ion replication deposition technology, the film thickness control accuracy reaches ±0.2nm, ensuring that the central wavelength is controlled at 405+/-1nm, FWHM is controlled at 12+/-1nm, with strict batch consistency
- The transmittance in the passband range of 399-411nm is greater than or equal to 90%, and the cutoff depth outside the passband is OD>=6 in the range of 350-1000nm, effectively suppressing the UV background noise and visible light stray interference.
- Through the stacking of nano-level multi-layer dielectric films, the UV-blue light signal can be accurately extracted
- Our substrate is made of UV-grade fused quartz, which supports miniaturized design, square and round are missing, and can provide fast proofing and mass production services.
405nm Filter with 12nm Bandwidth Technical Datasheet
| Parameter | Specification |
| Center Wavelength (CWL) | 405nm ± 1 nm |
| Full Width at Half Maximum (FWHM) | 12nm± 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 |
405nm Filter 12nm Narrowband Applications
- Fluorescence microscope
The excitation/emission spectra of fluorescent markers DAPI and Hoechst are concentrated in the 405nm laser in the ultraviolet-blue light band. The target fluorescence signal needs to be accurately separated to avoid background light interference. The 405/12nm filter can be integrated into the microscope optical path as an excitation filter or emission filter to match the spectral window of the light source and the detector. This allows only 405nm laser to pass through and efficiently excite fluorescent dyes. Or block the reflection/scattering noise of the excitation light and only transmit the fluorescence signal. - Blue laser
405nm lasers are usually used for optical storage and laser printing. It is necessary to suppress spontaneous radiation noise and stray wavelengths to ensure the output spectral purity. The 405/12nm filter can embed the filter into the laser resonator outlet or the back end of the optical path as a spectral line purifier. Filter out non-405nm wavelength components to compress the laser line width to within ±1nm. - UV fluorescence counterfeiting
Banknotes, certificates, etc. use invisible fluorescent markers excited by 405nm, which need to be stably identified in complex lighting environments. The 405/12nm narrowband filter can be integrated into the imaging module of a portable counterfeit detector, with a 405nm LED light source and a CMOS sensor. - Raman spectrometer
The Raman signal is weak, and the Rayleigh scattering noise of the excitation light 405nm needs to be strictly shielded. The 405/12nm narrowband filter can efficiently transmit the Raman shift signal, meeting the needs of trace component analysis in pharmaceuticals and materials science.
