532/0.5nm Ultra Narrow Filter
532/0.5nm ultra narrow filter is an optical filter transmits around 532nm with FWHM 0.5nm. Coligh manufactures ultra narrow bandpass filter narrow to FWHM 0.25nm
- Center wavelength 532nm
- FWHM 0.5nm
- Transmission Peak above 90%
- Deep blocking depth
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532/0.5nm Optical Ultra Narrow Bandpass Filter Description
532/0.5nm Ultra Narrow Band Filter is a high-performance ultra-narrow band filter with a central wavelength of 532nm and a bandwidth of only 0.5nm.
- Its main function is to accurately extract target signals such as laser lines, fluorescent markers, and Raman characteristic peaks through extremely narrow passband and deep noise suppression. At the same time, it eliminates stray light, autofluorescence, and environmental interference.
- Central wavelength 532+/-0.1nm, half bandwidth 0.5+/-0.1nm, accurately locks the 532nm target wavelength, and separates spectral overlapping signals
- The transmittance in the passband is greater than 90%, maximizing the retention of signal intensity and reducing light energy loss.
- Out-of-band cutoff depth OD>6 in the range of 200-1100nm, full-band suppression of non-target light
532/0.5nm Ultra Narrow Filter Technical Datasheet
| Parameter | Specification |
| Center Wavelength | 532 nm ±0.1nm |
| FWHM | 0.5 nm ±0.1 nm |
| Transmission Peak | >=90% |
| Blocking depth | 200-1100nm@OD>6 |
| AOI | 0° or custom |
| Substrate | Fused Silica |
| 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 |
532/0.5nm Ultra Narrow Filter Applications
- Real-time monitoring of nitrogen dioxide
The Raman characteristic peak of NO₂ at 532nm is weak and easily masked by sunlight background noise, making it difficult to achieve high-sensitivity detection. The 0.5nm half-bandwidth of the 532/0.5nm ultra-narrowband filter can accurately match the NO₂ Raman shift and suppress sunlight broadband noise - Scientific research experiments
In the laser cooling and capture of rubidium atoms, cold atom experiments require the laser wavelength to be accurately locked to the atomic transition line, but the frequency jitter of the laser will reduce the cooling efficiency. The 532/0.5nm bandpass filter can filter out light of non-locked wavelengths and improve the laser frequency stability. - LiDAR
In high-precision ranging and obstacle recognition for autonomous driving, ambient light will interfere with the LiDAR echo signal, resulting in ranging errors or misjudgments. The 532/0.5nm ultra-narrow filter can only pass through the 532nm laser echo signal, suppressing 99.9999% of ambient light noise and improving detection distance and resolution
