532/0.25nm Ultra Narrow Band Filter
532/0.25nm Ultra Narrow Band Filter is a high-precision optical filter that transmits a very narrow range around 532nm. Coligh manufactures ultra narrow bandpass filter FWHM narrow to 0.25nm.
- Center wavelength 532nm
- FWHM 0.25nm
- Transmission Peak above 90%
- Deep blocking depth
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532/0.25nm Optical Ultra Narrow Bandpass Filter Description
532/0.25nm Ultra Narrow Band Filter is a high-performance ultra-narrow band filter with a central wavelength of 532nm and a bandwidth of only 0.25nm.
- The central wavelength is 532+/-0.1nm, the half bandwidth is 0.25+/-0.1nm, and the wavelength selectivity is industry-leading. It is suitable for high-precision demand scenarios such as laser line width compression and single photon detection.
- The transmittance is greater than 90% in the range of 532+/-0.12nm, which retains the signal strength to the greatest extent and improves the system signal-to-noise ratio (SNR).
- The cut-off depth OD6 in the range of 200-1100nm, the stray light suppression exceeds 99.9999%, and the Raman scattering interference of adjacent wavelengths is eliminated.
- We use fused quartz and sapphire for hard interference coating. The film layer has high hardness and wear resistance and can withstand high-power laser irradiation
532/0.25nm Ultra Narrow Band Filter Technical Datasheet
| arameter | Specification |
| Center Wavelength | 532 nm ±0.1 nm |
| FWHM | 0.25+/-0.1nm |
| Transmission Peak | >=90% |
| Blocking depth | 200-1100@OD>6 |
| AOI | 0° or custom |
| Substrate | Fused Silica， Sappire |
| Surface Quality | 60/40 40/20（MIL-PRF-13830B） |
| Coating Type | Hard Coating |
| Clear Aperture | >90% of diameter |
| Regular size | Dia10mm, Dia12.5mm, Dia25.4mm, Dia50.8mm or custom |
532/0.25nm Ultra Narrow Band Filter Applications
- Quantum communication
Quantum communication relies on single-photon signal purity, but the spontaneous radiation noise output by the laser can introduce bit errors and threaten the security of communication. The 532/0.25nm ultra-narrow filter accurately screens the 532nm target photons, compresses the laser linewidth to the sub-nanometer level, and eliminates multi-mode noise - Multiphoton imaging
In multiple fluorescence channels, the excitation spectra are prone to overlap, resulting in signal crosstalk and affecting imaging accuracy. The 532/0.25nm filter can accurately match the excitation wavelength of specific fluorescent dyes, such as FITC, to avoid crosstalk between adjacent channels. At the same time, the extremely deep out-of-band cutoff depth can: block other excitation light and non-target fluorescence signals - Industrial laser processing
The stability of the laser wavelength directly affects the processing accuracy, but thermal drift or mode hopping of the laser can cause wavelength shift and cause cutting errors. This filter can lock the 532nm wavelength,: filter out light of non-target wavelengths, and ensure the purity of the processing beam wavelength. - Spectral analysis
In isotope analysis, the Raman shift difference of isotopes is extremely small. Sub-nanometer spectral resolution is required to distinguish. 532/0.25nm bandpass filter can resolve and separate subtle Raman shifts of isotope-labeled molecules
