650nm Bandpass Filter FWHM 10nm
650nm Bandpass Filter FWHM 10nm is an optical filter to transmit 645nm to 655nm and blocking other wavelength. Coligh manufactures plenty of EUV to FIR bandpass filters.
- Center Wavelength 650nm
- FWHM 10nm
- Tp>90%
- OD4 deep blocking depth
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650nm Bandpass Filter FWHM 10nm Description
650nm Bandpass Filter (FWHM 10nm) is a narrow bandpass optical filter designed for the red light band (645–655nm).
- The central wavelength is 650nm+/-2nm, and the half bandwidth is 10+/-2nm, ensuring super-selective transmission of the target red light.
- The transmittance is greater than or equal to 90% in the passband, retaining the effective light signal to the greatest extent and reducing the energy loss of the light source.
- The cut-off depth is OD4 in the range of 200-1200nm, and the cut-off range covers the ultraviolet to near-infrared bands to avoid multi-wavelength crosstalk.
- We use ion-assisted deposition (IAD) technology, hard film, and the film layer is wear-resistant and corrosion-resistant.
650nm Bandpass Filter FWHM 10nm Technical Datasheet
| Parameter | Specification |
| Center Wavelength (CWL) | 650 nm ± 2 nm |
| Full Width at Half Maximum (FWHM) | 10 nm ± 2 nm |
| Peak Transmission | ≥ 90% |
| Blocking Range | 200 – 1200nm |
| Optical Density (OD) | OD4 |
| Angle of Incidence (AOI) | 0° |
| Clear Aperture | >90% of the diameter |
| Substrate Material | UV Fused Silica, K9,sapphire, Other optical glass |
| Size | Ø12.7mm, Ø25.4mm,Ø50.8mmor customizable |
| Environmental Durability | Compliant with MIL-STD-810G |
| Other avaliable wavelength | 650/20nm 650/30nm 650/40nm, 650/50nm, 650/60nm, 650/70nm, 650/80nm |
| Custom Option | EUV to 30,000nm |
| Filter Type | Multilayer Interference Bandpass Filter |
| Coating Technology | Ion-Assisted Deposition (IAD), Hard coated |
| Surface Quality | 80-50, 60-40, 40-20 (per MIL-PRF-13830B) |
650nm Bandpass Filter FWHM 10nm Applications
- Biomedicine
In flow cytometry or confocal microscopy, the emission light of red fluorescent markers such as Cy5 and Alexa Fluor 647 is concentrated near 650nm, but ambient light or excitation light leakage will interfere with signal acquisition. 650/10nm bandpass filter can accurately transmit 645–655nm fluorescence signals and completely shield 640nm excitation light and other background noise. - Machine vision
Food sorting machines need to use red light to identify surface defects such as brown spots on spoiled fruits, but ambient light such as white light in the workshop can cause misjudgment. 650/10nm red light filter only allows reflected light near 650nm to pass through, filtering out interference from other bands. It can improve sorting accuracy - Laser technology
650nm laser diodes are widely used in lidar and 3D sensing, but their output often contains sidelobe wavelengths or spontaneous radiation, which affects positioning accuracy. 650/10nm hard coated bandpass filter filters out non-650nm stray light to ensure the purity of the beam wavelength. - Astronomical Observation
In astronomical observation, the characteristic peak near 650nm is easily masked by wide-band noise, such as the redshift signal of carbon materials and the red emission line of stars. The 650/10nm filter can be used as a pre-filter to limit the range of incident light and suppress high-order diffraction interference.
