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1570/20nm Infrared Interference Filter
1570/20nm Infrared Interference Filter is an optical filter to transmit centered wavelength at 1570nm and 20nm FWHM. Coligh manufactures EUV to 30000nm filters.
- Center Wavelength 1570nm
- FWHM 20nm
- Tp>90%
- OD4 deep blocking depth
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1570/20nm Infrared Interference Bandpass Filter Description
1570/20nm infrared interference filter, designed for precise selection of infrared light near 1570nm wavelength (bandwidth 20nm).
- Central wavelength 1570+/-2nm, covering the L-band of optical fiber communication, methane gas absorption peak and key spectral range of industrial detection.
- Half bandwidth 20+/-2nm, adapted to the wavelength drift of light source (±10nm) or wide spectrum signal capture requirements
- 1560-1580nm transmission band, the transmittance in the transmission band is greater than or equal to 90%, significantly enhancing the weak signal detection capability.
- Outside passband cutoff depth 200-1700nm range OD4, suppresses thermal radiation interference, and ensures signal purity in high temperature scenes.
1570/20nm Infrared Interference Filter Technical Datasheet
| Parameter | Specification |
| Center Wavelength (CWL) | 1570 nm ± 2 nm |
| FWHM | 20 nm ± 2nm |
| Peak Transmission | ≥ 90% |
| Blocking Range | 200 – 1700nm |
| 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 available wavelength | 1570/10nm, 1570/20nm |
| 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 |
1570/20nm Infrared Interference Filter Applications
- Industrial process monitoring
High-temperature combustion gases (such as CO₂, H₂O) have wide-spectrum absorption near 1570nm, and narrow-band filters cannot cover multi-component signals. The 20nm bandwidth of the 1570/20nm filter can simultaneously capture the absorption characteristics of multiple gases and improve combustion efficiency - Natural gas monitoring
In the natural gas pipeline leakage monitoring of drone inspections, outdoor wind causes the methane absorption peak to shift. The 20nm bandwidth of this filter covers the main peak and offset range of methane, adapts to dynamic wind speed environments, and improves inspection efficiency - Vehicle-mounted radar
Strong light in cities at night interferes with laser echo signals. 1570/20nm filter, 1570nm band has strong ability to penetrate rain and fog, 20nm bandwidth and deep cutoff depth suppress background light. Improve detection distance - Fiber optic communication
Metropolitan area network coarse wavelength division multiplexing requires low-cost, wide channel spacing solutions. The 1570/20nm filter can isolate the crosstalk of 1550nm and 1590nm. The high transmittance reduces the power consumption of the optical module and increases the transmission distance.
