Factory advantage
*The factory has a long - standing history in the cold - processing of optical components, start from 2004,which endows it with rich experience and professional accumulation.
*It boasts strong technical strength, with advanced production processes, sophisticated mechanical equipment and perfect testing facilities.
*The factory continuously launches high - grade and high - tech optical components, including more than 100 types of Optical Colored Filter Glass and colorless optical glass filters and color - filtering sheets, as well as quartz glass, heat - insulating glass, ultraviolet glass, infrared glass, Optical Prism, cylindrical lenses,silk screen glass,Acrylic/PMMA Sheet etc.
*With reasonable prices, the factory provides products with high cost - effectiveness, which can meet the needs of different customers.
*The factory can ensure timely delivery, which helps customers reduce inventory costs and improve production efficiency.
Technical parameter
1. Thickness: 1mm in stock or OEM
2. Size: 5-86mm as needed
3. Surface quality: 60/40 optical level
4. Mount: Infrared AL mount as need
5.Transmittance: 92%
The FWHM 40nm 940nm IR (Infrared) Narrow Bandpass Filter is an optical component designed for infrared optical systems. Its core function is to transmit only infrared light with a central wavelength of 940 nanometers (nm) and a Full Width at Half Maximum (FWHM) of 40 nanometers, while efficiently blocking visible light, infrared light of other bands, and stray light outside this wavelength range, thereby achieving precise filtering and extraction of light signals in specific infrared bands.
Core Performance Indicators
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Peak Transmittance: The maximum transmittance of the filter at its CWL (940nm). High-quality filters typically achieve peak transmittance ≥ 80% (some premium models reach 90%+). Higher transmittance means less target IR signal loss, critical for low-light applications (e.g., low-illumination IR detection).
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Blocking Depth: The filter’s ability to block unwanted light, measured by the minimum transmittance in non-pass bands (e.g., visible light or off-target IR). Industrial-grade filters require blocking depth ≤ 0.1% (equivalent to an Optical Density, OD, of ≥ 2; OD = -log₁₀(T), where T = transmittance).
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- Usage Precautions
- Avoid Mechanical Damage: The multi-layer dielectric coating is fragile and scratch-prone. Handle the filter with clean, lint-free gloves (not bare hands).
- Proper Cleaning: If dust or stains accumulate, clean the filter with a lint-free optical cleaning cloth (e.g., microfiber or chamois) dampened with anhydrous ethanol or specialized optical cleaner. Do not use water, soap, or abrasive materials—these can damage the coating or leave residues.
- Control Operating Environment: Avoid using the filter in extreme temperatures (>85°C) or high humidity (>90% RH) unless it is rated for harsh conditions. Extended exposure to harsh environments can cause coating delamination or substrate warping.
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